feat: add support for costs

[NilsOveTen]

resolve #300

[codecov]

Codecov Report

❌ Patch coverage is 96.55172% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 83.52%. Comparing base (a04e658) to head (abb3621).

Files with missing lines	Patch %	Lines
...ain/kotlin/no/fdk/dataset_catalog/rdf/Namespace.kt	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #304      +/-   ##
============================================
+ Coverage     83.21%   83.52%   +0.31%     
  Complexity      177      177              
============================================
  Files            26       26              
  Lines          1084     1111      +27     
  Branches        210      213       +3     
============================================
+ Hits            902      928      +26     
- Misses           67       68       +1     
  Partials        115      115              

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