Make Python 3.12 compatible

Marcel Looserequested to merge
RAP-503_make-python3.12-compatible into master

Make LSMTool compatible with Python 3.12.

  • Replace setup.py with pyproject.toml
  • Optionally build binary extension using scikit-build-core; disabled by default, edit pyproject.toml to enable it
  • Use setuptools_scm to handle automatic version numbers

Closes RAP-503

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