✨ Add standard nox task(s) for preparing a release

[Nicoretti]

Summary

To simplify preparing a release, we want to have an automated task in nox which takes care of the relevant changes.

Details

Add a nox task named prepare-release which takes care of all common and error prone task regarding preparing a release:

• Updated version numbers
• Updated the changelog
• Create a commit and/or PR for the changes

Out of scope

• Updated workflow templates (not automated yet)
  (should be added in the future though)

[Nicoretti]

Notes and additions mentioned by @tkilias:

1. Release should run in CI, except in certain exceptions or edge cases
2. The release task should check if it is running in the CI
3. If a user wants to run the Release locally, he need force this via an option
4. As a user, I would like to trigger a release in the CI via CLI

[pj-spoelders]

Will be picked up next kehrwoche