Improve dev cycle

[oniboni]

Description

The project setup is rather outdated and does not comply to PEP 621. We need automated tests for CI/CD.

Background

pip 21.1 was released in 2021. Prior to this version a pyproject.toml was not yet supported for projects 1.

There have been lots of attempts to standardize the python project setup and multiple build backends exist with pros and cons for each of them.

Hatch seems to be the easiest way to setup and maintain projects and dev cycles, and brings static code analysis (backed by ruff) effortlessly to the project.

Definition of Done

• [x] setup.py -> pyproject.toml
• [x] setup hatch environments for dev jobs
• [x] find a way to test this plugin with mkdocs
• [x] add tests for raised and solved issues
• [x] add CI job to automate
• [x] add pre-commit hook(s) to simplify dev cycle
• [x] add documentation about how to develop within this project