chore: move python files into `python` subfolder #297

Job	Run time
Test	1m 59s
Run semantic-release	10s
build (ubuntu-22.04, linux, x86_64, build)	59s
build (ubuntu-22.04, linux, aarch64, build)	1m 21s
build (windows-2022, windows, x86_64, build)	2m 5s
build (windows-2022, windows, aarch64, build)	3m 22s
build (macos-14, macos, x86_64, build)	43s
build (macos-14, macos, aarch64, build)	38s
build (sdist, ubuntu-22.04, --out dist, false)	27s
check	2s
Publish to PyPI	0s
	11m 46s

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