Switch to pyproject.toml and poetry

[JR-1991]

Overview

This PR converts the previous setup.py implementation to the current standard of using pyproject.toml using poetry. For this all dependencies originally found within the requirements directory have been included as individual groups (e.g. dev, tests etc.). Furthermore, the requirements.txt file has been updated to include the dependencies with which the tests have been run, following the argument in this StackOverflow answer. Last but not least, a build.yml workflow has been added to test the library's build status and a publishing workflow publish.yml to publish on release automatically.

This PR also adds a linting workflow based on Ruff which implements flake8 and black rules. The pre-commit hook has also been modified to use ruff for linting and format checks. Ruff is much faster and the pre-commit hooks finish almost instantly - We love performance, don't we? 🤓

TLDR

• Switch from setup.py to pyproject.toml
• Addition of build.yml workflow to test build status
• Addition of lint.yml workflow for ruff linting
• Added ruff to pre-commit hooks

ToDo's

• Check which dependencies to keep, especially within dev group.
• Add workflow to test publishing at Test PyPI (access is required) Independent of this PR