Migrate from PHPStan to Mago for static code analysis

[acelaya]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.29%. Comparing base (933a820) to head (49be62b).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
functions/functions.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #183   +/-   ##
=========================================
  Coverage     99.29%   99.29%           
  Complexity      181      181           
=========================================
  Files            49       49           
  Lines           568      568           
=========================================
  Hits            564      564           
  Misses            4        4           

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