feat(oidc): client_secret_jwt client auth

[james-d-elliott]

This theoretically adds support for client_secret_jwt.

[authelia]

Artifacts

These changes are published for testing on Buildkite, DockerHub and GitHub Container Registry.

Docker Container

• docker pull authelia/authelia:feat-oidc-client-auth-secret-jwt
• docker pull ghcr.io/authelia/authelia:feat-oidc-client-auth-secret-jwt

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[codecov]

Codecov Report

Merging #5031 (c739a23) into master (9c84fa5) will decrease coverage by 0.13%.
The diff coverage is 69.23%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5031      +/-   ##
==========================================
- Coverage   68.53%   68.41%   -0.13%     
==========================================
  Files         283      283              
  Lines       20964    20982      +18     
  Branches      443      443              
==========================================
- Hits        14367    14354      -13     
- Misses       5821     5853      +32     
+ Partials      776      775       -1     

Flag	Coverage Δ
backend	68.84% <69.23%> (-0.14%)	⬇️
frontend	63.20% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
internal/oidc/config.go	73.89% <0.00%> (-2.06%)	⬇️
internal/oidc/types.go	91.78% <ø> (ø)
internal/oidc/discovery.go	97.87% <100.00%> (+0.25%)	⬆️
internal/server/handlers.go	87.09% <0.00%> (-6.16%)	⬇️
internal/regulation/regulator.go	94.00% <0.00%> (-6.00%)	⬇️
internal/storage/sql_provider.go	47.40% <0.00%> (-0.34%)	⬇️
internal/session/provider.go	73.52% <0.00%> (+8.82%)	⬆️