Features/add pre commit

[MaGering]

Fixes #16.

Open ToDos:

• Add mypy
• Format digipipe/digipipe with black and isort.

Before merging into dev-branch, please make sure that

• if data flow was adjusted: data pipeline run finishes successfully.
• new and adjusted code is formated using black and isort.
• the CHANGELOG.rst was updated.
• the docs were updated.

[MaGering]

@nesnoj this is ready for review. I've implemented the pre-commit checks with black, isort, pylint, flake8 and mypy.

Be warned, however, that the tests with pre-commit run -a do not pass for flake8, pylint and mypy. In digiplan repo we have a similar situation. We have said that we will leave the tests as they are for now and ideally take care of it in the future.

[nesnoj]

Yea, thx for this nice feature! ❤️
I haven't tested yet - one question in advance: Do you mind if we go for 80 chars line length for sake of readability?

[nesnoj]

The install instruction was buggy, install is a linux coreutil ;). Fixed in 751357a.

Another question: I added some ugly lines which were detected by pre-commit on commit. But it did not correct the files automatically which I experienced to be a very nice feature. What do you think, shall we activate this?

[MaGering]

ToDo before merge:

• Add if possible automatic fix option to ruff.

[nesnoj]

I removed myself as reviewer, please re-request as soon as you're done.

[MaGering]

Closed with opened PR #64, which represents cleaned up version of this PR.