Add PHPStan

[tangrufus]

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[codecov]

Codecov Report

❌ Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.38%. Comparing base (03e8843) to head (c92cb4f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Console/ModeOption.php	0.00%	1 Missing ⚠️
src/Console/SourceOption.php	0.00%	1 Missing ⚠️
src/Releases/OfflineReleases.php	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #47      +/-   ##
============================================
- Coverage     46.66%   46.38%   -0.29%     
- Complexity       44       45       +1     
============================================
  Files            14       14              
  Lines           165      166       +1     
============================================
  Hits             77       77              
- Misses           88       89       +1     

Flag	Coverage Δ
feature	27.71% <37.50%> (-0.17%)	⬇️
unit	19.87% <25.00%> (-0.13%)	⬇️

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