MediaSession2/Controller2: Add playlist support

This CL does the following:
 - Removes PlaylistParams argument from all playlist related methods.
   (i.e. setPlaylist(List, PlaylistParams) becomes setPlaylist(List))
 - Adds methods (to/fromBundle, to/fromBundleList) into MediaItem2.

Bug: 72537268
Test: Passed MediaSession2Test
Change-Id: I48ef69ad2728fb7de7efab10f4e077aec552dd0b
6 files changed