Add atlasopenmagic DID finder

[ponyisi]

Adds an atlasopenmagic DID finder to the backend (will need a frontend update for proper support in the client). Gives the list of URLs reported by the atlasopenmagic package for a given release/dataset[/skim] combination.

[codecov]

Codecov Report

❌ Patch coverage is 93.54839% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.15%. Comparing base (e9f9074) to head (059f5f4).

Files with missing lines	Patch %	Lines
...sopenmagic/src/did_finder_atlasopenmagic/celery.py	93.54%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1292      +/-   ##
===========================================
+ Coverage    87.09%   87.15%   +0.05%     
===========================================
  Files           96       97       +1     
  Lines         3379     3410      +31     
  Branches       396      403       +7     
===========================================
+ Hits          2943     2972      +29     
- Misses         365      366       +1     
- Partials        71       72       +1     

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