Animate activity starts from widgets

The widget host view now implemented LaunchableView, which allows
animating activities from the view when an activity is started by the
widget.

Fixes: 318758390
Test: atest CommunalAppWidgetHostTest
Test: atest CommunalEditModeviewModelTest
Test: atest CommunalViewModelTest
Test: atest WidgetInteractionHandlerTest
Flag: ACONFIG com.android.systemui.communal_hub DEVELOPMENT
Change-Id: I6cb030109e1125fb1062e9e970c5833b04d0b36c