Ratelimit based on JWT claim

[pdabelf5]

Proposed changes

Allow the rate-limiting policy to use a $jwt_claim_ variable to be used as the key in the rate limit zone

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

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.73%. Comparing base (86c9752) to head (8c47bf9).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7175   +/-   ##
=======================================
  Coverage   52.73%   52.73%           
=======================================
  Files          89       89           
  Lines       20843    20843           
=======================================
  Hits        10992    10992           
  Misses       9394     9394           
  Partials      457      457           

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[ADubhlaoich]

LGTM, though I wonder if the example could be made a live documentation page instead of a repo example (I know it's relatively small).

At the least, creating a link to it somewhere from documentation makes it more discoverable.