Show AcousticBrainz info in the Recording sidebar

Following MBS-9503, I suggest to add basic AcousticBrainz information on the Recording pages sidebar so that it is more visible than the basic link in the Details tab.

I created a branch to display:

• number of submissions to AB
• (if not zero) BPM
• (if not zero and confidence in tonality > 50%): tonality (e.g. C major, etc.)

I think it makes more sense to display this info in the sidebar (acoustic information next to recording information) rather than in the fingerprints tab but I could understand if people prefer the second solution (to avoid querying the acousticbrainz.org API every time a Recording page is displayed).

Related to MBS-9500 since I am using more or less the same UI as the existing userscript