Metadata APIs for more exhaustive database

[Sheraff]

• [x] lastfm
• [x] the audio db (1 call per 2 seconds): https://www.theaudiodb.com/api_guide.php ~- [ ] AudD (paid) (fingerprinting): https://docs.audd.io/~
• [x] accoustiID (musicbrainz) (3 requests per second) (fingerprinting): https://acoustid.org/webservice
• [x] spotify (no shared ID w/ ecosystem): https://developer.spotify.com/documentation/web-api/reference/#/operations/get-recommendations