feat: preserve_host feature for oauth2_introspect

[alnr]

• fixed lots of lint issues
• bump to Go 1.21
• fixed context passing, cancelation, and tracing in a couple of places
• added the preserve_host option which already exists in the cookie_session and bearer_token authenticators to the oauth2_introspection authenticator.
• added the prefix option to the oauth2_introspection and bearer_token authenticators. This allows you to filter out tokens based on a string prefix.

[codecov[bot]]

Codecov Report

Merging #1131 (aa9555c) into master (5bf9b70) will decrease coverage by 0.07%. Report is 1 commits behind head on master. The diff coverage is 87.17%.

:exclamation: Current head aa9555c differs from pull request most recent head 50be903. Consider uploading reports for the commit 50be903 to get more accurate results

@@            Coverage Diff             @@
##           master    #1131      +/-   ##
==========================================
- Coverage   78.22%   78.16%   -0.07%     
==========================================
  Files          80       80              
  Lines        3863     3898      +35     
==========================================
+ Hits         3022     3047      +25     
- Misses        566      576      +10     
  Partials      275      275              

Files Changed	Coverage Δ
api/health.go	0.00% <ø> (ø)
metrics/prometheus.go	95.74% <ø> (ø)
credentials/fetcher_default.go	62.00% <64.28%> (-3.78%)	:arrow_down:
driver/registry_memory.go	90.45% <100.00%> (ø)
middleware/grpc_middleware.go	72.41% <100.00%> (ø)
pipeline/authn/authenticator_bearer_token.go	76.05% <100.00%> (+1.81%)	:arrow_up:
pipeline/authn/authenticator_cookie_session.go	81.03% <100.00%> (+0.85%)	:arrow_up:
pipeline/authn/authenticator_jwt.go	83.87% <100.00%> (+0.82%)	:arrow_up:
...e/authn/authenticator_oauth2_client_credentials.go	73.88% <100.00%> (ø)
...peline/authn/authenticator_oauth2_introspection.go	81.72% <100.00%> (+1.72%)	:arrow_up:
... and 5 more

[aeneasr]

Looks like the changes are causing issues with the cache!

[alnr]

Looks like the changes are causing issues with the cache!

I've seen this flake before. Must be something internal to ristretto. Couldn't reproduce it locally, even with go test -count=100 🤷