Uses MusicKit MusicCatalogSearchRequest to find the current track, then
fetches editorialVideo.motionTallVideo3x4 HLS URL via MusicDataRequest.
The animated artwork URL is pre-fetched on track change and cached per
song for instant availability.
Adds NSAppleMusicUsageDescription to Info.plist for MusicKit
authorization.
Signed-off-by: Jis G Jacob <studiokeys@blissroms.org>
