feat: skolemize blank nodes

[codecov[bot]]

Codecov Report

Merging #121 (dc2c2b5) into main (3bca0f5) will increase coverage by 0.73%. The diff coverage is 91.17%.

@@             Coverage Diff              @@
##               main     #121      +/-   ##
============================================
+ Coverage     75.31%   76.04%   +0.73%     
  Complexity      117      117              
============================================
  Files            24       24              
  Lines           644      668      +24     
  Branches         97       99       +2     
============================================
+ Hits            485      508      +23     
  Misses           94       94              
- Partials         65       66       +1     

Impacted Files	Coverage Δ
...ervice_harvester/harvester/DataServiceHarvester.kt	76.81% <33.33%> (ø)
..._dataservice_harvester/harvester/HarvestHelpers.kt	88.77% <96.66%> (+2.28%)	:arrow_up:
...valtning/fdk_dataservice_harvester/rdf/RDFUtils.kt	80.95% <100.00%> (ø)

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