[TextInput] send `setEditingState` before `show` to the text input plugin when switching input clients (#92945)

Support for Windows home/end keyboard shortcuts

Adds floatingLabelAlignment to position the label above the field.

* Added the new Material 3 colors to ColorScheme.

* Deprecated primaryVariant and secondaryVariant colors in the ColorScheme.

* Added a flutter fix for the deprecated colors.

Fixing a calculation when jumping to an offset with a large caret as compared to the viewport.

This reverts commit e4b78ffc.