Exclude tracks from PlayerInfo if not changed

This change includes a change in the `IMediaController.aidl` file and needs
to provide backwards compatibility for when a client connects that is of an older or
newer version of the current service implementation.

This CL proposes to create a new AIDL method `onPlayerInfoChangedWithExtensions`
that is easier to extend in the future because it does use an `Bundle` rather than
primitives. A `Bundle` can be changed in a backward/forwards compatible way
in case we need further changes.

The compatibility handling is provided in `MediaSessionStub` and `MediaControllerStub`. The approach is not based on specific AIDL/Binder features but implemented fully in application code.

Issue: androidx/media#102
#minor-release
PiperOrigin-RevId: 490483068

library/common/src/main/java/com/google/android/exoplayer2/Player.java

@@ -674,7 +674,8 @@ public interface Player {
      * to the current {@link #getRepeatMode() repeat mode}.
      *
      * <p>Note that this callback is also called when the playlist becomes non-empty or empty as a
-     * consequence of a playlist change.
+     * consequence of a playlist change or {@linkplain #onAvailableCommandsChanged(Commands) a
+     * change in available commands}.
      *
      * <p>{@link #onEvents(Player, Events)} will also be called to report this event along with
      * other events that happen in the same {@link Looper} message queue iteration.