Polish domain and repository for use in UI

 - adds playback to MediaDeviceSession to change react to playback
   changes;
 - adds media output user actions handling interactor;
 - improves naming in a few places;
 - moved fakes from SettingsLib to SystemUI;

Flag: aconfig new_volume_panel DISABLED
Test: atest MediaOutputAvailabilityCriteriaTest
Test: atest MediaControllerRepositoryImplTest
Test: atest MediaOutputInteractorTest
Bug: 323538193
Change-Id: I20450f7bfb3bedcb6834d11104f0eaaae3306f50