feat: Add pre-commit hooks

[rvermootenct]

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name: Pull Request about: Create a pull request to make a contribution labels:

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IMPORTANT NOTICE: I read and understood the guidelines for contributions to the TRD. The contribution may qualify for being compensated by the TRD grant if approved by the maintainers.

This PR resolves the issue 632 The following steps were performed:

I have installed pre-commit package and setup the hooks to run black and flake8 on files changed.

• Check list:

• [ ] I extended the Github Actions CI test units with the corresponding tests for this new feature (if needed).

• [ ] I extended the Sphinx documentation (if needed).

• [ ] I extended the help section (if needed).

• [X] I changed the README file (if needed).

• [ ] I created a new issue if there is further work left to be done (if needed).

Work effort: 1h

[jdsika]

I think I have to use a fixed version here as well, right? https://github.com/tezos-reward-distributor-organization/tezos-reward-distributor/blob/master/.github/workflows/ci.yml