Added the skip_verification option.

[svetlyi]

This option is intended for users who prefer to verify the JWT token elsewhere while still leveraging other features provided by the module.

All the details are provided in the comment for SkipVerification in jwt.go. In short, we verify the token after the Caddy proxy in the upstreams, but we still need the other features offered by the plugin, especially parsing and populating user metadata.

Hopefully it would be useful for other people as well.

Thanks.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.05%. Comparing base (5f1c2a8) to head (1f4273d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #85      +/-   ##
==========================================
+ Coverage   94.83%   95.05%   +0.22%     
==========================================
  Files           2        2              
  Lines         329      344      +15     
==========================================
+ Hits          312      327      +15     
  Misses         12       12              
  Partials        5        5              

Flag	Coverage Δ
unittests	95.05% <100.00%> (+0.22%)	⬆️

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[ggicci]

LGTM, thanks for the contribution :)