`flutter build aar`

This new build command works just like `flutter build apk` or `flutter build appbundle`, but for plugin and module projects.

This PR also refactors how plugins are included in app or module projects. By building the plugins as AARs, the Android Gradle plugin is able to use Jetifier to translate support libraries into AndroidX libraries for all the plugin's native code. Thus, reducing the error rate when using AndroidX in apps.

This change also allows to build modules as AARs, so developers can take these artifacts and distribute them along with the native host app without the need of the Flutter tool. This is a requirement for add to app.

`flutter build aar` generates POM artifacts (XML files) which contain metadata about the native dependencies used by the plugin. This allows Gradle to resolve dependencies at the app level. The result of this new build command is a single build/outputs/repo, the local repository that contains all the generated AARs and POM files.

In a Flutter app project, this local repo is used by the Flutter Gradle plugin to resolve the plugin dependencies. In add to app case, the developer needs to configure the local repo and the dependency manually in `build.gradle`:


repositories {
    maven {
        url "<path-to-flutter-module>build/host/outputs/repo"
    }
}

dependencies {
    implementation("<package-name>:flutter_<build-mode>:1.0@aar") {
       transitive = true
    }
}

This reverts commit 11460b83.

`flutter build aar`

This new build command works just like `flutter build apk` or `flutter build appbundle`, but for plugin and module projects.

This PR also refactors how plugins are included in app or module projects. By building the plugins as AARs, the Android Gradle plugin is able to use Jetifier to translate support libraries into AndroidX libraries for all the plugin's native code. Thus, reducing the error rate when using AndroidX in apps.

This change also allows to build modules as AARs, so developers can take these artifacts and distribute them along with the native host app without the need of the Flutter tool. This is a requirement for add to app.

`flutter build aar` generates POM artifacts (XML files) which contain metadata about the native dependencies used by the plugin. This allows Gradle to resolve dependencies at the app level. The result of this new build command is a single build/outputs/repo, the local repository that contains all the generated AARs and POM files.

In a Flutter app project, this local repo is used by the Flutter Gradle plugin to resolve the plugin dependencies. In add to app case, the developer needs to configure the local repo and the dependency manually in `build.gradle`:


repositories {
    maven {
        url "<path-to-flutter-module>build/host/outputs/repo"
    }
}

dependencies {
    implementation("<package-name>:flutter_<build-mode>:1.0@aar") {
       transitive = true
    }
}

https://github.com/flutter/engine/compare/d6970bf36a1e...1f3013163d48

git log d6970bf36a1e3d7409f7fe10f2092fbd5442d3fb..1f3013163d48f46cc967b31aac193691ef28f7d9 --no-merges --oneline
1f3013163 Roll src/third_party/skia 6dc14ded91ea..00c680d2bb7c (10 commits) (flutter/engine#10011)
de6e82c09 CopyFiles is still used. (flutter/engine#10012)
1c5e5b36f Roll fuchsia/sdk/core/linux-amd64 from tY_fod_tTCLft3FAUUxCP_HdLIahaJJK4WCXOA7nNGQC to M5an7VPM8DiCcNcKe6J0CkAtLk8X9oMeJUqGOrZATIsC (flutter/engine#10008)
3aaeca3a5 Android Embedding Refactor PR36: Add splash screen support. (flutter/engine#9525)
268533e86 [fuchsia] Use GatherArtifacts to create the requisite dir structure (flutter/engine#10004)
196141717 Exit flutter_tester with an error code on an unhandled exception (flutter/engine#9932)
be8819e2d Declare a copy of the enable_bitcode flag within the Flutter build scripts for use in Fuchsia builds (flutter/engine#10003)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (aaclarke@google.com), and stop
the roller if necessary.

https://github.com/flutter/engine/compare/9e9da56b8923...d6970bf36a1e

git log 9e9da56b8923f2bcec6ba91ee2b1d3e4affebdca..d6970bf36a1e3d7409f7fe10f2092fbd5442d3fb --no-merges --oneline
d6970bf36 Roll src/third_party/skia ebab03ffbffb..6dc14ded91ea (6 commits) (flutter/engine#10005)
6f3a2eb13 [macos] Add reply to binary messenger (flutter/engine#9953)
a7ef5086b Clean up cirrus.yml file a little (flutter/engine#9958)
68d269e0a Roll src/third_party/dart a089199b93..fedd74669a (8 commits) (flutter/engine#10001)
a004a6ed5 Roll fuchsia/sdk/core/linux-amd64 from FBDZ1EXEOcpLsJY4a5JRok5wPvXm5SURbJw1V7lpfKUC to tY_fod_tTCLft3FAUUxCP_HdLIahaJJK4WCXOA7nNGQC (flutter/engine#10000)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (aaclarke@google.com), and stop
the roller if necessary.

Extracted from https://github.com/flutter/flutter/pull/36205

* use sentence case in error message titles

* add a test

https://github.com/flutter/engine/compare/849fe7317031...9e9da56b8923

git log 849fe7317031bb8f59b54999029f507185d2fb0f..9e9da56b8923f2bcec6ba91ee2b1d3e4affebdca --no-merges --oneline
9e9da56b8 [luci] Reference the right fuchsia CIPD and upload only once (flutter/engine#9998)
d1cba30a7 Roll src/third_party/skia 7c01208e7800..ebab03ffbffb (1 commits) (flutter/engine#9997)
8855ffd8e Roll fuchsia/sdk/core/linux-amd64 from Kxwo4klJ1u6vmb1zw43v_h5lyPM-BvaHEdTQpXJCfakC to FBDZ1EXEOcpLsJY4a5JRok5wPvXm5SURbJw1V7lpfKUC (flutter/engine#9996)
1b6ee8c27 Roll src/third_party/skia ba35d079524b..7c01208e7800 (1 commits) (flutter/engine#9995)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (aaclarke@google.com), and stop
the roller if necessary.

Plus:

- Resume the app being run after expression has been evaluated to prevent the test run being forcefully terminated because it didn't end
- Skip non-JSON when waiting for JSON (eg. when running in verbose mode for debugging locally)
- Pass defaultTimeout in waitForJson (otherwise the assert in _timeoutWithMessages fails when it's not provided)

Closes https://github.com/flutter/flutter/issues/26518 (the original reason for skip was fixed in https://github.com/dart-lang/sdk/issues/34224).

Made the Flutter Gallery use the new ThemeMode property so that it can
use the system's dark/light mode setting by default.

* Add images and update examples for top widgets:

  - scaffold
  - text field
  - image
  - text
  - row
  - column
  - stack

849fe7317 Roll fuchsia/sdk/core/linux-amd64 from LzAZ73b7HYPMtDJnxjnYwMBuiVP6TsVmWIQb9xud4MEC to Kxwo4klJ1u6vmb1zw43v_h5lyPM-BvaHEdTQpXJCfakC (flutter/engine#9994) (#36672)


https://github.com/flutter/engine/compare/c7ed23a7567d...849fe7317031

git log c7ed23a7567d723554500d01f1226ced6db3dffe..849fe7317031bb8f59b54999029f507185d2fb0f --no-merges --oneline
849fe7317 Roll fuchsia/sdk/core/linux-amd64 from LzAZ73b7HYPMtDJnxjnYwMBuiVP6TsVmWIQb9xud4MEC to Kxwo4klJ1u6vmb1zw43v_h5lyPM-BvaHEdTQpXJCfakC (flutter/engine#9994)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (aaclarke@google.com), and stop
the roller if necessary.

https://github.com/flutter/engine/compare/ea4654a30b06...c7ed23a7567d

git log ea4654a30b0625d701fd42bbcc2743794d7a47ce..c7ed23a7567d723554500d01f1226ced6db3dffe --no-merges --oneline
c7ed23a75 Roll src/third_party/skia 056bdda97a83..ba35d079524b (5 commits) (flutter/engine#9992)
b384ce8f5 Roll fuchsia/sdk/core/linux-amd64 from 3y8oGujcy9aTj2lCGSzNVsho-P-bpHKb232KAEfVeUkC to LzAZ73b7HYPMtDJnxjnYwMBuiVP6TsVmWIQb9xud4MEC (flutter/engine#9990)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (aaclarke@google.com), and stop
the roller if necessary.

ea4654a30 Update GN to git_revision:152c5144ceed9592c20f0c8fd55769646077569b (flutter/engine#9987) (#36657)


https://github.com/flutter/engine/compare/5b7c0089e3ca...ea4654a30b06

git log 5b7c0089e3caeaa5d118530c2cf17470214bf4c0..ea4654a30b0625d701fd42bbcc2743794d7a47ce --no-merges --oneline
ea4654a30 Update GN to git_revision:152c5144ceed9592c20f0c8fd55769646077569b (flutter/engine#9987)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (aaclarke@google.com), and stop
the roller if necessary.

This reverts commit bd52a78c.

5b7c0089e Roll fuchsia/sdk/core/linux-amd64 from XblLr-Z5sgUUhC-LBbHZvqPJ6_WU8TvGqp0iWXzqs7sC to 3y8oGujcy9aTj2lCGSzNVsho-P-bpHKb232KAEfVeUkC (flutter/engine#9982) (#36650)


https://github.com/flutter/engine/compare/576fea92a5fd...5b7c0089e3ca

git log 576fea92a5fda023bfdc2639f5cca1821d342cdb..5b7c0089e3caeaa5d118530c2cf17470214bf4c0 --no-merges --oneline
5b7c0089e Roll fuchsia/sdk/core/linux-amd64 from XblLr-Z5sgUUhC-LBbHZvqPJ6_WU8TvGqp0iWXzqs7sC to 3y8oGujcy9aTj2lCGSzNVsho-P-bpHKb232KAEfVeUkC (flutter/engine#9982)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (aaclarke@google.com), and stop
the roller if necessary.

https://github.com/flutter/engine/compare/fc68f6abc2a5...576fea92a5fd

git log fc68f6abc2a5bcb289357883998dc1760408fc7c..576fea92a5fda023bfdc2639f5cca1821d342cdb --no-merges --oneline
576fea92a Roll fuchsia/sdk/core/linux-amd64 from NyebqfNgs14SKX5MfRRJqlYDx_SmsA0-9Y44MvmZF4cC to XblLr-Z5sgUUhC-LBbHZvqPJ6_WU8TvGqp0iWXzqs7sC (flutter/engine#9981)
3e8d96bc5 Roll fuchsia/sdk/core/linux-amd64 from Xq3lmEx3UuShBJaeiufLR-fHSqxgbKzbPVFP4OwI6tYC to NyebqfNgs14SKX5MfRRJqlYDx_SmsA0-9Y44MvmZF4cC (flutter/engine#9980)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (aaclarke@google.com), and stop
the roller if necessary.

https://github.com/flutter/engine/compare/1fb61b0344e8...fc68f6abc2a5

git log 1fb61b0344e86961c3a4e59b013caf02fd52a2c2..fc68f6abc2a5bcb289357883998dc1760408fc7c --no-merges --oneline
fc68f6abc Roll fuchsia/sdk/core/linux-amd64 from aS7wbI2Khbg1tZ8OnisA3S1_MkmHezyAxHTYXPPjlaIC to Xq3lmEx3UuShBJaeiufLR-fHSqxgbKzbPVFP4OwI6tYC (flutter/engine#9979)
bc774f914 Roll src/third_party/skia efe259bb2afd..056bdda97a83 (2 commits) (flutter/engine#9978)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (aaclarke@google.com), and stop
the roller if necessary.

1fb61b034 Roll fuchsia/sdk/core/linux-amd64 from OTgeiyD91rvjon5gklfSkUzti5kkQ4criJqpiDhoe7IC to aS7wbI2Khbg1tZ8OnisA3S1_MkmHezyAxHTYXPPjlaIC (flutter/engine#9976) (#36630)


https://github.com/flutter/engine/compare/9196576e3a5c...1fb61b0344e8

git log 9196576e3a5cbf3c83afca4df9a7be59eb39080a..1fb61b0344e86961c3a4e59b013caf02fd52a2c2 --no-merges --oneline
1fb61b034 Roll fuchsia/sdk/core/linux-amd64 from OTgeiyD91rvjon5gklfSkUzti5kkQ4criJqpiDhoe7IC to aS7wbI2Khbg1tZ8OnisA3S1_MkmHezyAxHTYXPPjlaIC (flutter/engine#9976)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (aaclarke@google.com), and stop
the roller if necessary.

https://github.com/flutter/engine/compare/cd1d7d639937...9196576e3a5c

git log cd1d7d639937aaa31e63de62a4012a877616dcae..9196576e3a5cbf3c83afca4df9a7be59eb39080a --no-merges --oneline
9196576e3 Roll fuchsia/sdk/core/linux-amd64 from w8MJpcP6-8lOFwkD9oHTR0ha9RvKibpSrN6F-ulwH88C to OTgeiyD91rvjon5gklfSkUzti5kkQ4criJqpiDhoe7IC (flutter/engine#9974)
d7a52516e Roll fuchsia/sdk/core/linux-amd64 from gKsp5vROpSRBvxFeqWLrcxbN-CPGrh8jd8JV4wyPpowC to w8MJpcP6-8lOFwkD9oHTR0ha9RvKibpSrN6F-ulwH88C (flutter/engine#9973)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (aaclarke@google.com), and stop
the roller if necessary.

This reverts commit b61fcfd2.

cd1d7d639 Roll src/third_party/skia a7ad120fb6c1..efe259bb2afd (1 commits) (flutter/engine#9972) (#36620)


https://github.com/flutter/engine/compare/483199060230...cd1d7d639937

git log 48319906023084cbe8c01cc207651ee89c37e871..cd1d7d639937aaa31e63de62a4012a877616dcae --no-merges --oneline
cd1d7d639 Roll src/third_party/skia a7ad120fb6c1..efe259bb2afd (1 commits) (flutter/engine#9972)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (aaclarke@google.com), and stop
the roller if necessary.

https://github.com/flutter/engine/compare/325f5b66dcc0...483199060230

git log 325f5b66dcc0d32ed344a3d8555572c2fb995dc1..48319906023084cbe8c01cc207651ee89c37e871 --no-merges --oneline
483199060 Roll fuchsia/sdk/core/linux-amd64 from Hi1zcJ3r59vNGXdA57i6fhuAk02Af8p5BHwvj45cCnIC to gKsp5vROpSRBvxFeqWLrcxbN-CPGrh8jd8JV4wyPpowC (flutter/engine#9971)
e7245cd7b Roll fuchsia/sdk/core/linux-amd64 from 8TNm8LtekvIJNYrWK9JBsM3qONKGYnyHufXhidbBKWsC to Hi1zcJ3r59vNGXdA57i6fhuAk02Af8p5BHwvj45cCnIC (flutter/engine#9969)
2c071370a Roll src/third_party/skia be91f062d70e..a7ad120fb6c1 (3 commits) (flutter/engine#9968)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (aaclarke@google.com), and stop
the roller if necessary.

https://github.com/flutter/engine/compare/9cf13568e2aa...325f5b66dcc0

git log 9cf13568e2aa1f9ab37445037e2ef54ecb5146f8..325f5b66dcc0d32ed344a3d8555572c2fb995dc1 --no-merges --oneline
325f5b66d Roll fuchsia/sdk/core/linux-amd64 from i5kNl7ZKu6X9AqpFLP4d5vDqQ4k9CtaQIk3x3WLVFxMC to 8TNm8LtekvIJNYrWK9JBsM3qONKGYnyHufXhidbBKWsC (flutter/engine#9967)
fe0ffc7f6 Roll fuchsia/sdk/core/linux-amd64 from LNYN3mEv2NJLUmZf6nGD5IWqOjDDiXpPeV2l4YWI0j8C to i5kNl7ZKu6X9AqpFLP4d5vDqQ4k9CtaQIk3x3WLVFxMC (flutter/engine#9966)
0ac94f75a Roll fuchsia/sdk/core/linux-amd64 from Hjo8G2HMO-S2RkQO8NOJNFH9t9QlspYq810NONDB8e0C to LNYN3mEv2NJLUmZf6nGD5IWqOjDDiXpPeV2l4YWI0j8C (flutter/engine#9964)
8fda1c99b Fix return type of assert function in gradient_test (flutter/engine#9961)
79bb7a583 Roll fuchsia/sdk/core/linux-amd64 from yCNSGMzcBMQzda_aHXqXWoW1cLSen0AL64orTFH-qHcC to Hjo8G2HMO-S2RkQO8NOJNFH9t9QlspYq810NONDB8e0C (flutter/engine#9960)
736c28b35 Update Dart engine tests to check for assertion failures only when running in debug mode (flutter/engine#9959)
b56e1ad79 Roll src/third_party/skia 4a13119a60e2..be91f062d70e (3 commits) (flutter/engine#9956)
61e2ba1db Roll src/third_party/dart 63120303a7...a089199b93 (flutter/engine#9951)
da0fcf828 Updates to the engine test runner script (flutter/engine#9934)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (aaclarke@google.com), and stop
the roller if necessary.

https://github.com/flutter/engine/compare/5467f6f63046...9cf13568e2aa

git log 5467f6f63046620b0ef1edc72ae06f9fad941cee..9cf13568e2aa1f9ab37445037e2ef54ecb5146f8 --no-merges --oneline
9cf13568e Added hasRenderedFirstFrame() to old FlutterView for Espresso (#36211). (flutter/engine#9939)
8d28215c8 Fix caching of Locale.toString (flutter/engine#9920)
b1276efa7 Roll fuchsia/sdk/core/linux-amd64 from kKw24ZxMzd4Hx6mCaVBSxBJxx7wIKmxP8txe9Cp0dxIC to yCNSGMzcBMQzda_aHXqXWoW1cLSen0AL64orTFH-qHcC (flutter/engine#9955)
649e025f7 Removed PlatformViewsController if-statements from TextInputPlugin (#34286). (flutter/engine#9938)
ede88d7df Roll src/third_party/skia aa861a1907a1..4a13119a60e2 (9 commits) (flutter/engine#9950)
48b1340ad Fix the geometry test to reflect that OffsetBase comparison operators are a partial ordering (flutter/engine#9925)
971c3f24a Roll fuchsia/sdk/core/linux-amd64 from XG_fYb35A8mJpnMG_I9iBm7yHJyNZYZRgG69a88us_sC to kKw24ZxMzd4Hx6mCaVBSxBJxx7wIKmxP8txe9Cp0dxIC (flutter/engine#9947)
3d7f93a2e Removed logic from FlutterAppDelegate into FlutterPluginAppLifeCycleDelegate (flutter/engine#9893)
273f4cfe8 Split out lifecycle protocol (flutter/engine#9922)
f41be3ea6 Roll src/third_party/skia 58d1f76fc008..aa861a1907a1 (7 commits) (flutter/engine#9946)
53f620f45 [platform view] do not make clipping view and interceptor view clipToBounds (flutter/engine#9937)
a1faebb8f Roll fuchsia/sdk/core/linux-amd64 from IPgI5Uh4rIZ4zNfAV1_ynC4dGmFLexAW1L9czHUyjowC to XG_fYb35A8mJpnMG_I9iBm7yHJyNZYZRgG69a88us_sC (flutter/engine#9945)
309ad63e6 Roll src/third_party/skia 95528752e2bd..58d1f76fc008 (1 commits) (flutter/engine#9944)
d852e8a64 Roll src/third_party/skia 19547c91b983..95528752e2bd (1 commits) (flutter/engine#9943)

The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (aaclarke@google.com), and stop
the roller if necessary.