LB-1585: Add Syndication Feeds to ListenBrainz

[ericd23]

Tracking PR for https://summerofcode.withgoogle.com/programs/2024/projects/k4Iq0Pnx :smile_cat:

• [ ] Feed authentication (MB OAuth)
• [ ] Feed UI (including a summary page in the settings?)

Endpoints:

• [ ] My feed (auth needed): /user/<username>/feed/events
• [x] User listens: /user/<username>/listens
• [ ] User stats: /stats/user/<username>/*
• [ ] Playlist (updates): /playlist/<playlist_mbid>
• [ ] Recommendations (Weekly jams and explorations)
• [x] Fresh releases: /explore/fresh-releases and /user/<username>/fresh_releases
• [ ] Stats art