This adds support for the release handling. To align with the
established behavior in ExoPlayer, the player can only call
listeners from within the release methods (and not afterwards)
and automatically enforces an IDLE state (without listener call)
in case getters of the player are used after release.
PiperOrigin-RevId: 493543958
(cherry picked from commit 4895bc42ff656ba77b604d8c7c93cba64733cc7a)
3b55ce2a60