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This PR is to make `InputDecorationTheme` conform to Flutter Material's conventions for component themes: - Added a `InputDecorationThemeData` class which defines overrides for the defaults for `InputDecorator` properties. - Added `InputDecorationTheme` constructor parameters: `InputDecorationThemeData? data` and `Widget? child`. This is now the preferred way to configure a `InputDecorationTheme`: ```dart InputDecorationTheme( data: InputDecorationThemeData( filled: true, fillColor: Colors.amber, ... ), child: const TextField() ) ``` These two properties are made nullable to not break existing apps which has customized `ThemeData.inputDecorationTheme`. - Update `InputDecorationTheme` to be an `InheritedTheme` subclass. - Changed the type of component theme defaults from `InputDecorationTheme` to `InputDecorationThemeData`. - Changed the `InputDecorationTheme bottomAppBarTheme` property to `Object? bottomAppBarTheme` in `ThemeData` and `ThemeData.copyWith()` (Object? is used for the moment to minimize Google tests failure. A follow-up PR will replace `Object?` with `InputDecorationThemeData`. - Addresses the "theme normalization" sub-project within #91772. A migration guide will be created on website repo.