Added support to x-enum-varnames and x-enum-descriptions

[nanocfw]

[Kludex]

This is not in the OpenAPI specs.

[Mause]

Is this still required now that https://github.com/tiangolo/fastapi/pull/1429 is merged?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (cf73051) 100.00% compared to head (955affd) 100.00%. Report is 1036 commits behind head on master.

:exclamation: Current head 955affd differs from pull request most recent head ac7ffb3. Consider uploading reports for the commit ac7ffb3 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #3384   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          540       540           
  Lines        13969     13953   -16     
=========================================
- Hits         13969     13953   -16     

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[github-actions[bot]]

📝 Docs preview for commit 955affdb03915a69dfbc358fc64835ee7b303a0b at: https://631e12c27538454c1c1e2211--fastapi.netlify.app

[github-actions[bot]]

📝 Docs preview for commit ac7ffb39a36a54c3217a83ce45842e42536ec598 at: https://639cd3f0e3fa3c117532f573--fastapi.netlify.app