chore: move python files into `python` subfolder (#240) #298

Job	Run time
Test	1m 54s
Run semantic-release	13s
build (ubuntu-22.04, linux, x86_64, build)	1m 7s
build (ubuntu-22.04, linux, aarch64, build)	1m 24s
build (windows-2022, windows, x86_64, build)	1m 59s
build (windows-2022, windows, aarch64, build)	3m 32s
build (macos-14, macos, x86_64, build)	53s
build (macos-14, macos, aarch64, build)	39s
build (sdist, ubuntu-22.04, --out dist, false)	18s
check	1s
Publish to PyPI	0s
	12m 0s

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