* Updated `AutomatedTestWidgetsFlutterBinding.pump` to use microseconds instead of milliseconds
* Added a test to prevent regression of the microsecond precision
* Fixed a test that incorrectly assumed millisecond precision

Closes #112610

* Pulled `FinderBase` out of `Finder`
  * `FinderBase` can be used for any object, not just elements
  * Terminology was updated to be more "find" related
* Re-implemented `Finder` using `FinderBase<Element>`
  * Backwards compatibility maintained with `_LegacyFinderMixin`
* Introduced base classes for SemanticsNode finders
* Introduced basic SemanticsNode finders through `find.semantics`
* Updated some relevant matchers to make use of the more generic `FinderBase`

Closes #123634
Closes #115874

Closes https://github.com/flutter/flutter/issues/125920

I will add tests, polish code, etc, if this change looks generally OK!

Most of these imports were never appropriate. The `test_api` package was never intended for use in `_test.dart` files.
Where possible move imports to `matcher`, otherwise move them to `test` or `flutter_test`.

Leave uses of `test_api` from `flutter_test` library code.

* Make Flex,Row,Column const for real

* dart fix --apply

* fix snippets

* fix integration test

* add comment

* Add MediaQuery to View

* unify API

* fix test

* add test

* comment

* better doc

* Apply suggestions from code review
Co-authored-by: Greg Spencer <gspencergoog@users.noreply.github.com>
Co-authored-by: Greg Spencer <gspencergoog@users.noreply.github.com>

Revert "`AutomatedTestWidgetsFlutterBinding.pump` provides wrong pump time stamp, probably because of forgetting the precision" (#113415)

`AutomatedTestWidgetsFlutterBinding.pump` provides wrong pump time stamp, probably because of forgetting the precision (#112609)

Add "excluding" optional parameter to TargetPlatformVariant to communicate cases where test should be ran everywhere but specific platforms (#106216)

added "excluding" optional parameter to targetPlatforms.all
Co-authored-by: Anthony Oleinik <oleina@google.com>

Revert "Add ability for `ModalRoutes` to ignore pointers during transitions and do so on `Cupertino` routes (#95757)" (#104520)

This reverts commit 4c0b0be2.

Add ability for `ModalRoutes` to ignore pointers during transitions and do so on `Cupertino` routes (#95757)

This reverts commit 5fd259be.

This reverts commit d056500b.

This reverts commit 31de052e.

This reverts commit e2490f29.

Adds tests to the following behaviors, which have existed without tests:

- When tapping during live testing, a message is printed with widgets that contain the tap location.
- When tapping during live testing, a mark is displayed on screen on the tap location.