Add pre-commit to project

[brueggemann]

I think we should add pre-commit to enforce black and probably other formatting/linting to pre-commit hooks.
After that some Makefile should be implemented to setup the dev environment and pre-commit install should be called there.

[brueggemann]

@NotTheEvilOne do you know any best practices for a requirements.txt that is only needed in dev environments? Because this PR will add pre-commit (and its dependencies) to requirement.txt. I think this is not what we want

[NotTheEvilOne]

Yes, requirements.txt is for the "setuptools" based build process to define all runtime requirements. Based on PEP 621 there's no defined way to accomplish this requirement as part of a "development tool set for the project".

As "pre-commit" is only relevant for Git and this upstream effort I would suggest to check for the dependency in the pre-commit Git hook itself and add a sensible error message otherwise.