Move to pyproject.toml

[lostella]

Description of changes: the objective is to move all of the project config and metadata from setup.py and setup.cfg to pyproject.toml

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[lostella]

      ValueError: invalid pyproject.toml config: `project`.
      configuration error: `project` must contain ['version'] properties

We're currently handling the __version__ in python with some automagic-git-tag-related trick. Having the version written down in pyproject.toml would require that we update it manually when tagging I guess?

[abdulfatir]

This seems related: https://setuptools.pypa.io/en/latest/userguide/pyproject_config.html#dynamic-metadata