[YouTube MusicBrainz Importer] Allow importing YouTube playlists into ListenBrainz

[chaban-mb]

Since 61fd6fe it's possible to import "mixes" or compilation videos into Listenbrainz as a playlist. The next logical step would be to allow importing actual YouTube playlists too.

[Lioncat6]

Might dig into your code to figure out what the heck gemini did and try to add this lol