Relax validation on enum values deserialization

[ludovicsteinbach]

Relax validation on enum values deserialization to allow types other than strings.
This, in addition to https://github.com/ansys/openapi-client-template/pull/235, is to fix https://github.com/ansys/openapi-client-template/issues/234.

See previous PR #751 for discussion, especially #751 (comment)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.43%. Comparing base (00c9151) to head (79005a8).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #755      +/-   ##
==========================================
- Coverage   94.43%   94.43%   -0.01%     
==========================================
  Files           7        7              
  Lines         791      790       -1     
==========================================
- Hits          747      746       -1     
  Misses         44       44              

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