backend/integration: add Spotify integration for fetching cover art

[vnghia]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 76.82119% with 35 lines in your changes missing coverage. Please review.

Project coverage is 80.10%. Comparing base (a010b9a) to head (aba6dfb).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
nghe-backend/src/integration/spotify.rs	54.83%	11 Missing and 3 partials ⚠️
nghe-backend/src/file/picture/mod.rs	66.66%	0 Missing and 6 partials ⚠️
nghe-backend/src/integration/informant.rs	89.79%	1 Missing and 4 partials ⚠️
nghe-backend/src/config/integration/mod.rs	83.33%	1 Missing and 1 partial ⚠️
nghe-backend/src/lib.rs	0.00%	2 Missing ⚠️
nghe-backend/src/orm/artist_informations.rs	83.33%	0 Missing and 2 partials ⚠️
nghe-backend/src/scan/scanner.rs	50.00%	2 Missing ⚠️
nghe-backend/src/config/mod.rs	0.00%	1 Missing ⚠️
nghe-backend/src/route/scan/mod.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #536      +/-   ##
==========================================
- Coverage   80.24%   80.10%   -0.15%     
==========================================
  Files         209      215       +6     
  Lines        5401     5568     +167     
  Branches     5401     5568     +167     
==========================================
+ Hits         4334     4460     +126     
- Misses        721      752      +31     
- Partials      346      356      +10     

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