Allow users of the stable API to register an EventLogger

Overriding any methods of AnalyticsListener requires using the unstable
API. In future we can incrementally add AnalyticsListener methods to the
stable API.

PiperOrigin-RevId: 445420361

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/ExoPlayer.java

@@ -1175,7 +1175,6 @@ public interface ExoPlayer extends Player {
    *
    * @param listener The listener to be added.
    */
-  @UnstableApi
   void addAnalyticsListener(AnalyticsListener listener);
 
   /**
@@ -1183,7 +1182,6 @@ public interface ExoPlayer extends Player {
    *
    * @param listener The listener to be removed.
    */
-  @UnstableApi
   void removeAnalyticsListener(AnalyticsListener listener);
 
   /** Returns the number of renderers. */