feat: New and improved docstrings in generated functions and classes

[dbanty]

Closes #503, replaces #505

[codecov]

Codecov Report

Merging #551 (4b492b8) into main (49580ec) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #551   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           48        48           
  Lines         1639      1661   +22     
=========================================
+ Hits          1639      1661   +22     

Impacted Files	Coverage Δ
...penapi_python_client/parser/properties/__init__.py	100.00% <ø> (ø)
..._python_client/parser/properties/model_property.py	100.00% <ø> (ø)
openapi_python_client/parser/openapi.py	100.00% <100.00%> (ø)
...penapi_python_client/parser/properties/property.py	100.00% <100.00%> (ø)
openapi_python_client/parser/responses.py	100.00% <100.00%> (ø)

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