Create python package for linter

[SvenUmbricht]

This PR intends to address #27. I have never distributed a package before, so feedback is welcome.

[dbeyer]

@PhilippWendler Could you please review?

[PhilippWendler]

Is this to be assigned to @SvenUmbricht?

[SvenUmbricht]

@PhilippWendler Can we merge this? From my side the PR is ready, do you have anything else to add?

[PhilippWendler]

@PhilippWendler Can we merge this? From my side the PR is ready, do you have anything else to add?

This PR is for @MartinSpiessl to review and accept, I am just providing some comments. I am also not doing a full review (e.g., I did not actually install Poetry and try everything out, which would of course be needed for a proper review), just telling you when I notice something. And I have no experience with Poetry.

[MartinSpiessl]

Regarding poetry: I looked into it and found it to be quite nice (apart from the terrible installation procedure, cf. https://github.com/sosy-lab/sv-witnesses/pull/39#discussion_r812578932), so I would say we can use it for handling packaging etc.
If we encounter any problems in the future, we can still switch to something else. If not we might use it in other projects as well.