Add support for oneOf union properties in addition to anyOf

[dbanty]

No description provided.

[codecov]

Codecov Report

Merging #164 into main will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #164   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           41        41           
  Lines         1262      1263    +1     
=========================================
+ Hits          1262      1263    +1     

Impacted Files	Coverage Δ
openapi_python_client/parser/properties.py	100.00% <100.00%> (ø)
openapi_python_client/schema/schema.py	100.00% <100.00%> (ø)

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