Bug/Deprecation: Migrate from ExoPlayer 2.x to AndroidX Media3

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Summary

The project depends on com.google.android.exoplayer:exoplayer:2.19.1, which is deprecated and no longer receiving new features. Google has migrated ExoPlayer to AndroidX Media3.

Impact

• ExoPlayer 2.x is in maintenance-only mode; no new features are added.
• Building against deprecated libraries increases future technical debt.
• Media3 is the recommended library for all new Android media development.
• The project's demos/youtube and any other screens using ExoPlayer will need updating.

Proposed Changes

1. Replace com.google.android.exoplayer:exoplayer:2.19.1 with:

   androidx.media3:media3-exoplayer:1.x.x
   androidx.media3:media3-ui:1.x.x
   

2. Update import statements in all usages from com.google.android.exoplayer2.* to androidx.media3.*.
3. Update Versions.kt to remove the exoplayer entry and add a media3 entry.
4. Update Dependencies.kt and GroupedDependencies.kt accordingly.
5. Test playback in the YouTube demo screen.

References

• ExoPlayer migration guide to Media3
• Media3 release notes