fix(parser): Prevent crash when providing a non-string default to a string attribute. Fixes #414

[dbanty]

1. Fixes AttributeError: 'int' object has no attribute 'replace' #414
2. Changes __main__ to actually do what it's supposed to for debugging 😅
3. Catches attribute errors when converting defaults to prevent similar future crashes
4. Provides more detail in parse errors on endpoint bodies (needed while debugging)

[codecov]

Codecov Report

Merging #415 (125d3e0) into main (a731477) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #415   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           47        47           
  Lines         1549      1551    +2     
=========================================
+ Hits          1549      1551    +2     

Impacted Files	Coverage Δ
openapi_python_client/__main__.py	100.00% <100.00%> (ø)
openapi_python_client/parser/openapi.py	100.00% <100.00%> (ø)
...enapi_python_client/parser/properties/converter.py	100.00% <100.00%> (ø)

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