Docs: Add structured changelog

[provinzkraut]

Ensure a consistent structure and layout of our changelog by introducing two new directives:

• .. changelog::
• .. change::

A changelog can be described as

.. changelog:: 2.3.4

  .. change:: This fixes a bug
    :type: bugfix
    :pr: <related pull request>
    :issue: <related issue>

    Here goes the description of the bug fix


  .. change:: This is a new feature
    :type: feature
    :pr: <related pull request>

    Here goes the description of the new feature

Our Sphinx extension will then generate an ordered changelog from these.

Pull Request Checklist

• New code has 100% test coverage
• (If applicable) The prose documentation has been updated to reflect the changes introduced by this PR
• (If applicable) The reference documentation has been updated to reflect the changes introduced by this PR

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• follow Starlite's Contribution Guidelines

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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[JacobCoffee]

love it