SDK / exoplayer

This combines all the different listeners in ExoVideosPlayerV2 into one and
moves the PlaybackLogger class towards ExoPlayer's AnalyticsCollector with
the same purpose.

In the future this allows two things:
 1. Gradually move LogginClient implementations to AnalyticsListener to
    prevent custom event forwarding.
 2. Using ExoPlayer's QoE extension (which is also an AnalyticsListener).

PiperOrigin-RevId: 232321182