Adds new feat and fix to https://github.com/flutter/flutter/issues/134341

The color of the TextField's cursor in error state is the same as the error text color by default. However we should be allowed to customize it

Fixes #135580

## Description

This PR fixes form fields in order to call the `onChange` callback when the form is reset.

This change is based on the work done in https://github.com/flutter/flutter/pull/123108.

I considered adding the `onChange` callback to the `FormField` superclass but it would break existing code because two of the three subclasses defines the `onChange` callback with `ValueChanged<String>?` type and the third one defines it with `ValueChanged<String?>?`. 

## Related Issue

Fixes https://github.com/flutter/flutter/issues/123009.

## Tests

Adds 3 tests.

Diposes some restorable variables that weren't disposed before.

Fixes: https://github.com/flutter/flutter/issues/132620

Contributes to https://github.com/flutter/flutter/issues/130467

Filed issue: https://github.com/flutter/flutter/issues/132620

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.

Updates most of the unit tests in the packages/flutter/test/material folder so that they'll pass if ThemeData.useMaterial3 defaults to true.

All of the tests have wired useMaterial3 to false and will need to be updated with a M3 version.

related to #127064

`TextFormField` does not have all the parameters of `TextField`.

Added:
```dart
    UndoHistoryController? undoController,
    AppPrivateCommandCallback? onAppPrivateCommand,
    bool? cursorOpacityAnimates,
    ui.BoxHeightStyle selectionHeightStyle = ui.BoxHeightStyle.tight,
    ui.BoxWidthStyle selectionWidthStyle = ui.BoxWidthStyle.tight,
    DragStartBehavior dragStartBehavior = DragStartBehavior.start,
    ContentInsertionConfiguration? contentInsertionConfiguration,
    Clip clipBehavior = Clip.hardEdge,
    bool scribbleEnabled = true,
    bool canRequestFocus = true,
```

TextFormField.spellCheckConfiguration

Remove 1745 decorative breaks

According to Material specs, cursor should be red in error state.

* Add tests

* fix tests

* updates
Co-authored-by: Renzo Olivares <roliv@google.com>

* Add 'mouseCursor' to TextFormField

Added 'mouseCursor' to TextFormField. 
Related issue: https://github.com/flutter/flutter/issues/99770

* added test for 'mouseCursor' in TextFormField.

added test for 'mouseCursor' in TextFormField.

* Update packages/flutter/test/material/text_form_field_test.dart
Co-authored-by: Tong Mu <dkwingsmt@users.noreply.github.com>

* Update packages/flutter/test/material/text_form_field_test.dart
Co-authored-by: Tong Mu <dkwingsmt@users.noreply.github.com>

* Minor update: Added a space.

* Removed icon & minor updates.
Co-authored-by: Tong Mu <dkwingsmt@users.noreply.github.com>

Before this change, it was possible to select and copy obscured text from a text field.

This  changes things so that:
- Obscured text fields don't allow copy or cut.
- If a field is both obscured and read-only, then selection is disabled as well (if you can't modify it, and can't copy it, there's no point in selecting it).

This reverts commit 5fd259be.

Simplifying and refactoring parts of RenderEditable. Functionality is the same.

Use the hasStrings clipboard method when possible instead of reading the contents of the clipboard.