feat: generic authenticator updated to consider ttl of the session object received from the identity_info_endpoint and to enable session validation

[dadrus]

closes #154

This is done by an introduction of a new session_lifespan property, which allows following configuration:

session_lifespan:
  active: <gjson path>
  issued_at: <gjson path>
  not_before: <gjson path>
  not_after: <gjson path>
  time_format: <string value>
  validity_leeway: <e.g. 5s>

Each gjson path value defines a path in a json document received from the endpoint to extract the corresponding value from. the value behind active should be convertable to a boolean value. All other are treated as strings, which are then converted to time values based on the given time_format and are then used to validate the session object itself and calculate required ttls.

[codecov]

Codecov Report

Merging #201 (4000f53) into main (869d8ae) will increase coverage by 0.32%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #201      +/-   ##
==========================================
+ Coverage   85.10%   85.43%   +0.32%     
==========================================
  Files         157      159       +2     
  Lines        6212     6322     +110     
==========================================
+ Hits         5287     5401     +114     
+ Misses        783      779       -4     
  Partials      142      142              

Impacted Files	Coverage Δ
...l/pipeline/authenticators/generic_authenticator.go	92.02% <100.00%> (+1.28%)	⬆️
...ernal/pipeline/authenticators/jwt_authenticator.go	92.70% <100.00%> (ø)
...ternal/pipeline/authenticators/session_lifespan.go	100.00% <100.00%> (ø)
...pipeline/authenticators/session_lifespan_config.go	100.00% <100.00%> (ø)
internal/x/compare.go	100.00% <100.00%> (ø)
internal/rules/repository.go	97.60% <0.00%> (+3.19%)	⬆️

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