Serve Artwork URL

[0xcaff]

The Artwork URL should probably be under a fixed url based on the album id.

Why?

This is currently the way songs are handled. Allowing Album.streamUrl to be anything allows for too much flexibility. When the album id is available, instead of querying the graphql endpoint then querying the url, the endpoint could be queried directly.

Why not?

Two queries need to be made to populate now playing anyway. This requires adding alternative handing for endpoints without album artwork.