SDK / exoplayer

Populate ICY headers into MediaMetadata so that they can
propagate to the app via AnalyticsListener#onMediaMetadataChanged().
This change copies IcyHeaders.name into MediaMetadata.description
and IcyHeaders.genre into MediaMetadata.genre.

Note: MediaItem.metadata maintain their precedence and overwrite any
ICY headers parsed.

Issue: google/ExoPlayer#9677

PiperOrigin-RevId: 410495676