Somewhat related to #81

If the api calls to connect with MusicBrainz are added in order to embed the metadata in the output file, would it be reasonable to also allow MusicBrainz ids as inputs? It gets a bit strange with the release vs. release-group distinction, but other than that I think it would be a fairly straightforward addition.

URL example: https://musicbrainz.org/release-group/082c6aff-a7cc-36e0-a960-35a578ecd937
Short URL example: mb:release-group:db92a151-1ac2-438b-bc43-b82e149ddd50

I have spare time and would be happy to help if this is a reasonable ask.