211 missing pyprojecttoml

[ymahlich]

This is a draft PR for an updated distribution / pypi build process.

This PR achieves:

• move from setup.py to pyproject.toml & hatch as build backend
• dynamic versioning of the sdist / wheel distro via git-tags
• use of dataset.yml to store and retrieve information internally for list_datasets(), download() and version() function

[ymahlich]

PR should be ready for merge. Test build and upload to https://test.pypi.org/project/coderdata/ was successful and install via pip install -i https://test.pypi.org/simple/ --extra-index-url https://pypi.org/simple coderdata==0.1.44 installed correctly including dependecies into a fresh python 3.9 environment.