Allow artists to be excluded in recommendations

[RadValentin]

API

• Implement exclude_artists on /api/v1/recommend/ endpoint

  "filters": {
    "exclude_artists": ["<artist-mbid>", "<artist-mbid>", "..."],
    "same_genre": true,
    "same_decade": true,
    "genre_classification": "rosamerica"
  },

Front-End

• Store a history of previously played tracks
• Extract a list of artist MBIDs from history, it gets sent to the recommend endpoint when a new set of data is fetched
  • By default it's 5 artists, on every request pop the oldest one - prevents the same artist showing up too frequently
  • Consider mechanism for users to disable this functionality, e.g. session storage or separate session API