Adds a macOS implementation of the platform_channel example,
demonstrating method channels and event channels with a battery power
plugin.

Adds platform_channel_sample_test_macos macOS host test to verify the
sample works.

Issue: https://github.com/flutter/flutter/issues/79204

Roll Packages from 75491e98c0d1 to 0826798d73b8 (5 revisions)

20ab040cd Roll Skia from ce5ff5cc03ce to c42320d53714 (2 revisions) (flutter/engine#40565) (#123340)

Roll Flutter Engine from c0fbe5a530b8 to 20ab040cdd68 (1 revision)

FIX: NavigationDrawer hover/focus/pressed do not use indicatorShape

c0fbe5a53 Roll Dart SDK from 9256fffbd5af to e8e045620234 (1 revision) (flutter/engine#40561) (#123336)

Roll Flutter Engine from 12c822327825 to c0fbe5a530b8 (1 revision)

implement Iterator and Comparable instead of extending them

Observatory can still be enabled by providing `--serve-observatory` or
invoking the `_serveObservatory` private service RPC via web socket or
HTTP.

Related to https://github.com/dart-lang/sdk/issues/50233

Roll Flutter Engine from 59acb5362098 to 12c822327825 (3 revisions)

59acb5362 Roll Skia from 4f1cae66791c to fc95eca74604 (7 revisions) (flutter/engine#40559) (#123318)

Roll Flutter Engine from 9e25f2f6ea42 to 59acb5362098 (1 revision)

9e25f2f6e Roll Dart SDK from 45a360d262c2 to 9256fffbd5af (2 revisions) (flutter/engine#40557) (#123314)

Roll Flutter Engine from 10ade9e22d8c to 9e25f2f6ea42 (1 revision)

Roll Flutter Engine from cd0a6ef93263 to 10ade9e22d8c (5 revisions)

Roll Flutter Engine from 3f9fe923b037 to cd0a6ef93263 (1 revision)

Co-authored-by: godofredoc <godofredoc@google.com>

3f9fe923b [Impeller] Add validation for mipmap generation enforced at binding time (flutter/engine#40515) (#123300)

Roll Flutter Engine from 02171d1f836c to 3f9fe923b037 (1 revision)

Co-authored-by: godofredoc <godofredoc@google.com>

Roll Flutter Engine from ccc32758588c to 02171d1f836c (3 revisions)

Revert "[flutter_tools] Remove sound null safety flag (#123031)"

Workaround for exhaustiveness bug in dart2js

Remove 1745 decorative breaks

Roll Flutter Engine from 5775c6b05fa4 to ccc32758588c (7 revisions)

Documentation improvements

Add documentation saying that people can add themselves to the AUTHORS file

Marks Linux engine_dependency_proxy_test to be unflaky

Roll Flutter Engine from bb51cda2fa47 to 5775c6b05fa4 (1 revision)

Update dartdoc to 6.2.0

Roll Packages from 694f82b34316 to 75491e98c0d1 (15 revisions)

Manual roll Flutter Engine from c266826b24bf to bb51cda2fa47 (7 revisions)

* Make custom `Utf8Decoder` replacement not extend platform class.

The Dart 3.0 class modifiers will make `Utf8Decoder`, and other
pure implementation classes, be `final`.

This replacement class does not need to extend the original
class, just like the `Utf8Codec` in the same file doesn't
extend the `Ut8Codec` from the platform libraries.

Instead it can just forward to a single `const` instance of the
original class.

* Forgot one constant

* Fix merge conflict.

---------
Co-authored-by: Zachary Anderson <zanderso@users.noreply.github.com>

Provide an ApplicationPackage to the flutter_tools logs command

c266826b2 Roll Skia from 574b1eefd3bd to c5a28115fe5f (3 revisions) (flutter/engine#40521) (#123196)

Roll Flutter Engine from d0e71494ad5f to c266826b24bf (1 revision)

Roll Flutter Engine from 718af87632ad to d0e71494ad5f (3 revisions)

718af8763 Roll Fuchsia Mac SDK from vdrDvqVpPEp_l5cT4... to Q2XkmCZ1C5vUGoxvz... (flutter/engine#40514) (#123186)

Roll Flutter Engine from 51082515db18 to 718af87632ad (1 revision)

Roll Flutter Engine from 9a742fa4eaf2 to 51082515db18 (1 revision)

Remove window reference from doc snippet

Co-authored-by: godofredoc <godofredoc@google.com>

9a742fa4e Roll Skia from 6cdd4b3f9b8e to 3e6bfdfea566 (3 revisions) (flutter/engine#40510) (#123181)

Roll Flutter Engine from 62f284479485 to 9a742fa4eaf2 (1 revision)

Roll Flutter Engine from 619d721c3686 to 62f284479485 (10 revisions)

* Marks Linux_android old_gallery__transition_perf to be unflaky

* trigger builds

---------
Co-authored-by: Keyong Han <keyonghan@google.com>
Co-authored-by: godofredoc <godofredoc@google.com>