Enhancement Proposal: Authentication Filter

[shaun-nx]

Proposed changes

Status set to Implementable after merging #4136

This document proposes a solution for enabling Authentication use cases through NGINX Gateway Fabric.

Closes #4052

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

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

NONE

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.12%. Comparing base (a2e2ec1) to head (c7fc379).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4234      +/-   ##
==========================================
+ Coverage   86.08%   86.12%   +0.03%     
==========================================
  Files         131      131              
  Lines       14162    14162              
  Branches       35       35              
==========================================
+ Hits        12192    12197       +5     
+ Misses       1766     1763       -3     
+ Partials      204      202       -2     

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