tidal: add cover art support via coverArt relationship

[arsaboo]

Description

Include coverArt in album API requests and parse the coverArts resources from the included array. The cover_art_url is passed to AlbumInfo(cover_art_url=...), which the fetchart plugin uses to retrieve album art. Falls back to constructing a URL from the cover art resource ID when no direct URL is available in the API response.

• Documentation. (If you've added a new command-line flag, for example, find the appropriate page under docs/ to describe it.)
• Changelog. (Add an entry to docs/changelog.rst to the bottom of one of the lists near the top of the document.)
• Tests. (Very much encouraged but not strictly required.)

cc: @semohr This is the first PR. I will add another one for popularity soon.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.54%. Comparing base (60047df) to head (3c95393).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6743      +/-   ##
==========================================
+ Coverage   74.52%   74.54%   +0.01%     
==========================================
  Files         162      162              
  Lines       20818    20832      +14     
  Branches     3295     3299       +4     
==========================================
+ Hits        15515    15529      +14     
  Misses       4547     4547              
  Partials      756      756              

Files with missing lines	Coverage Δ
beetsplug/tidal/__init__.py	86.43% <100.00%> (+1.02%)	⬆️

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[semohr]

Can we make this required as it should be always returned now?

[semohr]

Im pretty sure this wont work. The id used here is empheral and should only be used locally to match included data to the relationships.

For the example from here the id is 2xpmpI1s9DzeAPMlmNh9kM and the link https://resources.tidal.com/images/2xpmpI1s9DzeAPMlmNh9kM/1280x1280.jpg will result in an error.

[semohr]

Is there a way to pass multiple links to be used with fetchart? Fetchart has config options for min/maxwidth, right? We might be able to make use of the multiple files/artworks defined here.

[arsaboo]

AlbumInfo.cover_art_url only accepts a single URL, so we pass the first/largest file and let fetchart handle any resizing via its maxwidth/minwidth config. The current approach already covers the best resolution.