feat: Configurable fallback of authenticators even if the verification of the credentials fails

[dadrus]

closes #92
closes #133

[codecov]

Codecov Report

Merging #134 (0073a05) into main (ed61e18) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #134      +/-   ##
==========================================
+ Coverage   85.79%   85.86%   +0.06%     
==========================================
  Files         147      147              
  Lines        5547     5581      +34     
==========================================
+ Hits         4759     4792      +33     
- Misses        668      669       +1     
  Partials      120      120              

Impacted Files	Coverage Δ
...pipeline/authenticators/anonymous_authenticator.go	91.42% <100.00%> (+0.80%)	⬆️
...ipeline/authenticators/basic_auth_authenticator.go	93.38% <100.00%> (+0.34%)	⬆️
...l/pipeline/authenticators/generic_authenticator.go	90.74% <100.00%> (+0.99%)	⬆️
...ernal/pipeline/authenticators/jwt_authenticator.go	89.53% <100.00%> (+0.26%)	⬆️
...rnal/pipeline/authenticators/noop_authenticator.go	100.00% <100.00%> (ø)
...thenticators/oauth2_introspection_authenticator.go	92.07% <100.00%> (+0.25%)	⬆️
...eline/authenticators/unauthorized_authenticator.go	95.00% <100.00%> (+0.88%)	⬆️
internal/rules/composite_subject_creator.go	100.00% <100.00%> (ø)
internal/x/tracing/provider/instana/logger.go	75.00% <0.00%> (-25.00%)	⬇️
... and 1 more

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