refactor!: values property for endpoint teplating must be configured on the mechanism conf level

[dadrus]

Related issue(s)

related to #686

Checklist

• I agree to follow this project's Code of Conduct.
• I have read, and I am following this repository's Contributing Guidelines.
• I have read the Security Policy.
• I have referenced an issue describing the bug/feature request.
• I have added tests that prove the correctness of my implementation.
• I have updated the documentation.

Description

This PR makes the values property available in some mechanisms for endpoint path and query templating configurable on the config level of the particular mechanism and not at the level of the endpoint property any more. Same is true for usage in rules.

Old configuration:

 id: opa
 type: generic
 config:
   endpoint:
     url: http://opa:8181/v1/data/articles/{{ .Values.policy }}
     values:  # this property including its children has been moved one level up
       policy: can_read
   payload: |
     { 
        "user": {{ quote .Subject.ID }} 
     }

New configuration:

 id: opa
 type: generic
 config:
   endpoint:
     url: http://opa:8181/v1/data/articles/{{ .Values.policy }}
   values:  # now on the top level
     policy: can_read
   payload: |
     { 
        "user": {{ quote .Subject.ID }} 
     }

NOTE: This is a breaking change

[codecov]

Codecov Report

Merging #746 (7362123) into main (e5a363c) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #746      +/-   ##
==========================================
- Coverage   89.60%   89.59%   -0.02%     
==========================================
  Files         215      215              
  Lines        9238     9227      -11     
==========================================
- Hits         8278     8267      -11     
  Misses        767      767              
  Partials      193      193              

Impacted Files	Coverage Δ
internal/rules/mechanisms/values/values.go	100.00% <ø> (ø)
internal/endpoint/endpoint.go	93.33% <100.00%> (ø)
internal/endpoint/noop_renderer.go	100.00% <100.00%> (ø)
internal/endpoint/renderer.go	100.00% <100.00%> (ø)
...mechanisms/authenticators/generic_authenticator.go	92.27% <100.00%> (-0.06%)	⬇️
.../rules/mechanisms/authorizers/remote_authorizer.go	83.27% <100.00%> (-0.23%)	⬇️
...chanisms/contextualizers/generic_contextualizer.go	86.80% <100.00%> (-0.26%)	⬇️

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