feat: implement Asset/Dataset specialization pt. 2

[paullatzelsperger]

What this PR changes/adds

implements the second part of the preparatory work for Management Domains, specifically:

• makes Catalog extend Dataset
• improves the DatasetResolver and DistributionResolver so that they can handle CatalogAssets
• updates the JSON-LD transformers, so they can handle CatalogAssets

Why it does that

Management Domain feature, specifically handling distributed catalogs

Further notes

List other areas of code that have changed but are not necessarily linked to the main feature. This could be method
signature changes, package declarations, bugs that were encountered and were fixed inline, etc.

Linked Issue(s)

Closes #4296

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.20%. Comparing base (7f20ba5) to head (b0c53dc).
Report is 325 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4301      +/-   ##
==========================================
+ Coverage   71.74%   75.20%   +3.45%     
==========================================
  Files         919     1051     +132     
  Lines       18457    21109    +2652     
  Branches     1037     1182     +145     
==========================================
+ Hits        13242    15875    +2633     
+ Misses       4756     4720      -36     
- Partials      459      514      +55     

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[wolf4ood]

🚀

[jimmarino]

Question inline related to dependencies