Project metadata: Remove setup.py. Improve Python compatibility.

[amotl]

Just maintenance while modernizing project metadata: Remove outmoded setup.py, and transfer a few more details to new pyproject.toml.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch rm-setup-py

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