Replace StyleCI to PHP CS Fixer + Fix Psalm

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (373700f) to head (034e68d).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master       #56   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity         2         2           
===========================================
  Files              2         2           
  Lines              4         4           
===========================================
  Hits               4         4           

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