feat: dump OpenAPI YAML in python -m dotty.main (#100)

[holtgrewe]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.44%. Comparing base (7855139) to head (633011c).
Report is 50 commits behind head on main.

Files with missing lines	Patch %	Lines
dotty/main.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #101      +/-   ##
==========================================
- Coverage   86.78%   86.44%   -0.35%     
==========================================
  Files           4        4              
  Lines         174      177       +3     
==========================================
+ Hits          151      153       +2     
- Misses         23       24       +1     

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