Reverts flutter/flutter#131998

Reverting for https://github.com/flutter/flutter/issues/132222

Fixes https://github.com/flutter/flutter/issues/59413

This relocates `mock_canvas.dart` and `recording_canvas.dart` from `flutter/test/rendering` to `flutter_test`. 

The testing functionality afforded by mock_canvas should be available to everyone, not just the framework. :)

mock_canvas.dart needed a bit of cleanup - things like formatting and super parameters.

Updated and reorganized unit tests for `SwitchListTile` to have M2 and M3 versions.

More info in https://github.com/flutter/flutter/issues/127064

* Add missing parameters to SwitchListTile

* Update SwitchListTile doc

* Update doc for existing APIs

* Address comment

* Fix typo

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Co-authored-by: Qun Cheng <quncheng@google.com>

* Add trackOutlineColor for Switch and SwitchListTile

* Update tests

* Update test

* Clean up unnecessary StatefulBUilder in tests

* Fix failed test

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Co-authored-by: Qun Cheng <quncheng@google.com>

This reverts commit 5fd259be.

[CheckboxListTile, SwitchListTile, RadioListTile] Adds visualDensity, focusNode and enableFeedback (#89353)

This PR adds visualDensity, focusNode and enableFeedback to:

- CheckboxListTile
- SwitchListTile
- RadioListTile

This reverts commit 14552a96.

This reverts commit f8cd24de in an attempt to re-land it.

There are no changes in this PR from #74373, since it only failed Google internal tests, and we think that the solution involves updating those tests instead of changing this code.

This reverts commit 422916d2 because it causes unexpected changes in the rendering of the background of a ListTile.

This PR replaces the ColoredBox that ListTile uses with an Ink widget. That Ink widget is given a ShapeDecoration with the ListTile's color and shape. This fixes issues where the ListTile color would obscure material ripple effects, and cause the specified shape to not be respected.

This reverts commit 024c49da because it breaks Google internal tests.

This PR replaces the ColoredBox that ListTile uses with an Ink widget. That Ink widget is given a ShapeDecoration with the ListTile's color and shape. This fixes issues where the ListTile color would obscure material ripple effects, and cause the specified shape to not be respected.

List which issues are fixed by this PR. You must list at least one issue.

Fixes #73616
Fixes #63877
Fixes #67117

If you had to change anything in the flutter/tests repo, include a link to the migration guide as per the breaking change policy.

I modified a handful of tests related to ListTiles. The tests I changed had implementation-specific ways of checking the ListTile color. I have rewritten those so that instead of checking for a ColoredBox with a specific color, they check that a path is painted with the correct color.

I added the following tests to list_tile_test.dart:

"ListTile shows Material ripple effects on top of tileColor" (Regression test for #73616)
"ListTile shape is painted correctly" (Regression test for #63877)
I added the following test to sliver_prototype_item_extent_test.dart:

"SliverPrototypeExtentList prototypeItem paint transform is zero" (Regression test for #67117)

This removes the nullOk parameter from Focus.of, FocusTraversalOrder.of and FocusTraversalGroup.of, and creates maybeOf equivalents for each. The of methods now return non-nullable values, and the maybeOf equivalents return nullable values.

* add language version 2.8 in packages/flutter

* enable non-nullable analyzer flag