scanMissingArtists in scanQueuedArtists is rather inefficient

[nanoscopic]

scanMissingArtists function appears to be adding artists and albums that are not yet populated to the local DB.

It should be split to a scanMissingArtists and scanMissingAlbums function as those are two different things.

Further; it calls getTidalTracksUnordered, which fetches ALL tracks from the DB.
This is unnecessary.

select tt.* from tidal_tracks as tt left join tidal_artists as ta on tt.artist=ta.id where ta.id is NULL can be used to get tracks missing the artist

select tt.* from tidal_tracks as tt left join tidal_albums as ta on tt.album=ta.id where ta.id is NULL can be used to get tracks missing the album