fix(parser): Attempt to deduplicate endpoint parameters based on name and location (fixes #305)

[dbanty]

Reported by @seeM in #305.

[codecov]

Codecov Report

Merging #406 (63298f1) into main (890411a) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #406   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           46        47    +1     
  Lines         1531      1549   +18     
=========================================
+ Hits          1531      1549   +18     

Impacted Files	Coverage Δ
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/schema/__init__.py	100.00% <100.00%> (ø)
...on_client/schema/openapi_schema_pydantic/header.py	100.00% <100.00%> (ø)
...client/schema/openapi_schema_pydantic/parameter.py	100.00% <100.00%> (ø)
openapi_python_client/schema/parameter_location.py	100.00% <100.00%> (ø)

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[emann]

I don't super love the fact that the first duplicate-named parameter that is processed gets the name python_name and the others are python_name_where_it_is - better for all of them to be explicit IMO. I made a suggestion for how it could be done, LMK what you think.