Add py-mlflow and its dependencies (#34463)

* Add py-mlflow and its dependencies
* mlflow: fix syntax error in package.py
* py-mlflow: cleanup
  Process review remarks, add missing dependencies, add skinny variant
* Apply suggestions from code review
* Fix flake8 issues
* More formatting fixes
* Fix py-waitress dependency version
* py-mlflow: platform-specific dependency
* Update var/spack/repos/builtin/packages/py-mlflow/package.py
* Update var/spack/repos/builtin/packages/py-mlflow/package.py
* Process review remarks
* Fix typo in dependency version
* py-shap: fix dependencies
* py-arrow: fix dependencies
* py-slicer: remove py-setuptools explicit version
* py-pyarrow: dataset variant and pass options through environment
  It appears there are some issues when using `pip install` instead of
  `python setup.py` - this setup_build_environment should fix that.
* py-pyarrow: review remark
* Decouple setup_build_environment from install_options
* py-pyarrow: style
* Bump licenses to 2023

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Co-authored-by: Tamara Dahlgren <35777542+tldahlgren@users.noreply.github.com>
Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>
Co-authored-by: Matthias Wolf <matthias.wolf@epfl.ch>

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