MediaSession2: Add playlist parameter supports

This CL adds following APIs:
 - MediaPlayerInterface.set/getPlaylistParams()
 - MediaSession2.set/getPlaylistParams()
 - MediaController2.setPlaylistParams()
 - ControllerCallback.onPlaylistParamsChanged()

Bug: 72537520
Test: Passed MediaSession2Test
Change-Id: I84ea00ee0876725af1c0e01ad50da15fdb222418
6 files changed