This change deprecates `PlayerView.setUseArtwork(boolean)` and
introduces `setArtworkDisplayMode(mode)` and
`artworkDisplayMode="off|fit|fill"` instead.
- off: no artwork is displayed (like deprecated useArtwork=false)
- fit: letterbox like media (like deprecated useArtwork=true)
- fill: scales the artwork to fill the entire width/weight of the player view
#minor-release
PiperOrigin-RevId: 534167226
