Custom datasets loader

[MorrisNein]

• Created class CustomDatasetsLoader.
• Allowed to specify DatasetsLoader in KnowledgeBaseModelsLoader

[codecov[bot]]

Codecov Report

Merging #51 (2b197e9) into main (3cd4a8b) will decrease coverage by 1.11%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
- Coverage   42.25%   41.14%   -1.11%     
==========================================
  Files          26       27       +1     
  Lines         594      610      +16     
==========================================
  Hits          251      251              
- Misses        343      359      +16     

Files Changed	Coverage Δ
...aration/datasets_loaders/custom_datasets_loader.py	0.00% <0.00%> (ø)
...ion/models_loaders/knowledge_base_models_loader.py	0.00% <0.00%> (ø)