An artwork image representation, such as music album cover art, associated with a media item.
The system may display this artwork on the Lock Screen, in Control Center, and on
connected accessories.
Creates an ``ArtworkRepresentation`` from image data.
- Parameter data: The encoded image data.
- Throws: ``ArtworkRepresentationError/noRepresentationAvailable`` if the data
doesn't represent a valid image or uses an unsupported format.
Creates an ``ArtworkRepresentation`` from a `CGImage` instance.
If the provided image uses an unsupported format, this initializer returns `nil`.
- Parameter cgImage: The `CGImage` that represents the artwork.