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 74.62%. Comparing base (73605d5) to head (8435319).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6743      +/-   ##
==========================================
+ Coverage   74.60%   74.62%   +0.01%     
==========================================
  Files         163      163              
  Lines       20830    20844      +14     
  Branches     3283     3287       +4     
==========================================
+ Hits        15541    15555      +14     
  Misses       4538     4538              
  Partials      751      751              

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

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[semohr]

Lets name all these typeddict consistent with the tidal api and use Artwork instead of CoverArt.

[semohr]

A bit more compact and less readable ;)

    for item in album["relationships"].get("coverArt", {}).get("data", []):
        if item.get("type") == "artworks" and (files := cover_art_by_id.get(item.get("id"), {}).get("attributes", {}).get("files")):
            return files[0].get("href") if files else None
    return None

[semohr]

Let's not introduce a type ignore please. We should be able to type this with
dict[str, RelationshipData].