add auth_jwt_claim_set in nginx plus virtualserver template

[haywoodsh]

Proposed changes

This PR is the first in a series to implement the tiered rate-limits based on JWT claims feature. It updates the VirtualServer nginx plus templates to allow setting the auth_jwt_claim_set directive. It defines the AuthJwtClaimSet struct to contain the directive values.

Future PR's will drive the content to populate these data structures.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.71%. Comparing base (65b2d52) to head (acf2971).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7205      +/-   ##
==========================================
- Coverage   52.72%   52.71%   -0.01%     
==========================================
  Files          89       89              
  Lines       20843    20843              
==========================================
- Hits        10989    10987       -2     
  Misses       9396     9396              
- Partials      458      460       +2     

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