feat: allow customization of the response

[42atomys]

Describe the pull request

This pull request introduce the possibility to set the response of the webhook per spec using the formatting feature already present in the app.

Checklist

• I have linked the relative issue to this pull request
• I have made the modifications or added tests related to my PR
• I have added/updated the documentation for my RP
• I put my PR in Ready for Review only when all the checklist is checked

Breaking changes ?
no

[codecov]

Codecov Report

Attention: Patch coverage is 84.12698% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 93.86%. Comparing base (90c7e8c) to head (3b7b608).
Report is 3 commits behind head on main.

Files	Patch %	Lines
internal/config/configuration.go	28.57%	2 Missing and 3 partials ⚠️
internal/server/v1alpha1/handlers.go	82.14%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #177      +/-   ##
==========================================
- Coverage   94.11%   93.86%   -0.25%     
==========================================
  Files          22       22              
  Lines        1393     1435      +42     
==========================================
+ Hits         1311     1347      +36     
- Misses         56       60       +4     
- Partials       26       28       +2     

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