Enable readability-identifier-length and tune its settings

[aobolensk]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.70%. Comparing base (088e8c2) to head (fda8813).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #405   +/-   ##
=======================================
  Coverage   97.70%   97.70%           
=======================================
  Files          16       16           
  Lines         262      262           
  Branches       75       85   +10     
=======================================
  Hits          256      256           
  Misses          2        2           
  Partials        4        4           

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