feat: implement get dataset dsp endpoint

[ndr-brt]

What this PR changes/adds

Implement DSP /catalog/datasets/{id} endpoint

Why it does that

dsp compliance

Further notes

• now the Dataset id is the same as the Asset id.

Linked Issue(s)

Closes #3220
Closes #3231

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[codecov-commenter]

Codecov Report

Patch coverage: 34.42% and project coverage change: -57.34 ⚠️

Comparison is base (83df482) 65.94% compared to head (a2026bd) 8.60%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main   #3243       +/-   ##
==========================================
- Coverage   65.94%   8.60%   -57.34%     
==========================================
  Files         843     842        -1     
  Lines       16871   16891       +20     
  Branches      925     932        +7     
==========================================
- Hits        11126    1454     -9672     
- Misses       5375   15392    +10017     
+ Partials      370      45      -325     

Impacted Files	Coverage Δ
...pse/edc/connector/catalog/DatasetResolverImpl.java	0.00% <0.00%> (-100.00%)	⬇️
...or/service/catalog/CatalogProtocolServiceImpl.java	0.00% <0.00%> (-100.00%)	⬇️
.../eclipse/edc/service/spi/result/ServiceResult.java	0.00% <0.00%> (-47.83%)	⬇️
...atalog/api/controller/DspCatalogApiController.java	93.44% <100.00%> (+3.44%)	⬆️

... and 581 files with indirect coverage changes

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