Allow category deep nesting

[KROT47]

This PR is based on #21 and has only last commit as difference

Here we can use like this

getLogger(['app', ['deep', ['nested', ['string', ['array']]]]])
===
getLogger(['app', 'deep', 'nested', 'string', 'array'])

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.27%. Comparing base (988a27a) to head (9e70de8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
+ Coverage   97.24%   97.27%   +0.02%     
==========================================
  Files          10       11       +1     
  Lines        1018     1027       +9     
  Branches      217      217              
==========================================
+ Hits          990      999       +9     
  Misses         28       28              

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