feat(changelog): adds a changelog_release_hook called for each release in the changelog

[noirbizarre]

Description

This PR adds an optional changelog_release_hook allowing to customize/enrich each changelog release the same way we can customize/enrich each commit

Checklist

• Add test cases to all the changes you introduce
• Run ./scripts/format and ./scripts/test locally to ensure this change passes linter check and test
• Test the changes on the local machine manually
• Update the documentation for the changes

Expected behavior

End user and plugin developers can add attributes to each release dict and use them in their changelog template

Steps to Test This Pull Request

• add a changelog_release_hook to a plugin
• make it add some attributes to each release
• access/render them in the changelog template

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.46%. Comparing base (120d514) to head (5234ef4).
Report is 210 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1018      +/-   ##
==========================================
+ Coverage   97.33%   97.46%   +0.12%     
==========================================
  Files          42       55      +13     
  Lines        2104     2406     +302     
==========================================
+ Hits         2048     2345     +297     
- Misses         56       61       +5     

Flag	Coverage Δ
unittests	97.46% <100.00%> (+0.12%)	⬆️

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