SDK / exoplayer

Move VideoSize in the common module and have the Player return it.

`Listener` and `AnalyticsListener` `onVideoSizeChanged` are updated
with the old method deprecated.

`VideoRendererEventListener.onVideoSizeChanged` was also migrated to
`VideoSize` but the old method is removed, not deprecated.
This is because:
 - apps calling/listening to this method is a rare and niche use-case.
 - it would introduce hard to diagnostic issues where if only the caller
   or the callee is updated to use the new method, the event will be lost.
   This doesn't occur with the other 2 listeners as the caller is always
   in ExoPlayer library and was updated to call both the old and new methods.

VideoSize is used everywhere except in `Format` as this would lead to
too much refactoring and backward compatibility breakage for little gain.

#minor-release

PiperOrigin-RevId: 371087419