#24440 Adding support for android app bundle

To integrate more fully with iOS, this release adds several new features and fixes for iOS, including a new CupertinoTheme:

#25183 Add navigatorKey to CupertinoTabView

#25593 Let CupertinoTabScaffold handle keyboard insets too

#24876 Adds a fade in and out, rounds corners, fixes offset and fixes height of cursor on iOS

#23759 Adds CupertinoTheme

In addition to the iOS Cupertino theme support, this release continues to enhance the Material theme as well:

#24169 [Material] Theme-able elevation on dialogs

#25339 [Material] Theme-able TextStyles for AlertDialog