feat: Update OpenAPI implementation

[SMillerDev]

See also
https://github.com/SMillerDev/phpdraft/wiki/Extensions#openapi-api-key-configuration

[codecov]

Codecov Report

Attention: Patch coverage is 12.50000% with 70 lines in your changes missing coverage. Please review.

Project coverage is 64.76%. Comparing base (2d4a5e9) to head (5817f4d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/PHPDraft/Out/OpenAPI/OpenApiRenderer.php	8.00%	69 Missing ⚠️
...PHPDraft/Out/OpenAPI/Tests/OpenApiRendererTest.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #645      +/-   ##
============================================
- Coverage     65.29%   64.76%   -0.54%     
- Complexity      416      422       +6     
============================================
  Files            26       26              
  Lines          1118     1121       +3     
============================================
- Hits            730      726       -4     
- Misses          388      395       +7     

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[sonarqubecloud]

Quality Gate failed

Failed conditions
14.3% Coverage on New Code (required ≥ 80%)

See analysis details on SonarCloud