This API additions help an app to implement the lifecycle of a MediaSessionService
properly and in consistency with the `MediaSessionService` being in the foreground
or not.
Not properly implementing `onTaskRemoved` is the main reason for crashes and
confusion. This change provides `MediaSessionService` with a default
implementation that avoids crashes of the service. This default implementation
uses the new API provided with this change just as an app can do.
Issue: androidx/media#1219
PiperOrigin-RevId: 621874838