SDK / exoplayer

This change includes 3 things:
- when the legacy media session is created, FLAG_HANDLES_QUEUE_COMMANDS
  is advertised if the player has the COMMAND_CHANGE_MEDIA_ITEMS
  available.
- when the player changes its available commands, a new
  PlaybackStateCompat is sent to the remote media controller to
  advertise the updated PlyabackStateCompat actions.
- when the player changes its available commands, the legacy media
  session flags are sent accoridingly: FLAG_HANDLES_QUEUE_COMMANDS is
  set only if the COMMAND_CHANGE_MEDIA_ITEMS is available.

#minor-release

PiperOrigin-RevId: 506605905