feat: add StringCombinationTransformer

[premsrii]

New Transformer 💡

[codecov]

Codecov Report

Merging #108 (37554c3) into develop (c493677) will decrease coverage by 4.23%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #108      +/-   ##
===========================================
- Coverage    99.42%   95.19%   -4.23%     
===========================================
  Files            8        8              
  Lines          519      520       +1     
===========================================
- Hits           516      495      -21     
- Misses           3       25      +22     

Impacted Files	Coverage Δ
src/sk_transformers/__init__.py	100.00% <100.00%> (ø)
src/sk_transformers/datetime_transformer.py	100.00% <100.00%> (ø)
src/sk_transformers/generic_transformer.py	100.00% <100.00%> (+0.52%)	⬆️
src/sk_transformers/number_transformer.py	100.00% <100.00%> (ø)
src/sk_transformers/string_transformer.py	81.06% <100.00%> (-17.43%)	⬇️
src/sk_transformers/utils.py	100.00% <100.00%> (ø)

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