feat: add versions to domain model

[NilsOveTen]

resolve #39

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Please upload report for BASE (main@e25ccc1). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...in/no/fdk/dataservicecatalog/handler/RDFHandler.kt	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #40   +/-   ##
=======================================
  Coverage        ?   88.05%           
  Complexity      ?      101           
=======================================
  Files           ?       21           
  Lines           ?      469           
  Branches        ?       43           
=======================================
  Hits            ?      413           
  Misses          ?       16           
  Partials        ?       40           

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