refactor: split init.py into logical modules #79

Job	Run time
Build wheel on ubuntu-latest	33s
Build wheel on windows-latest	1m 5s
Build wheel on macos-latest	1m 20s
Test wheel on ubuntu-latest with Python 3.13	9s
Test wheel on ubuntu-latest with Python 3.9	10s
Test wheel on macos-latest with Python 3.9	33s
Test wheel on windows-latest with Python 3.13	26s
Test wheel on windows-latest with Python 3.9	37s
Test wheel on macos-latest with Python 3.13	19s
	5m 12s

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