PYTHON-4476 Separate data and IO classes more effectively #484

Job	Run time
Make SDist	42s
Build wheels for manylinux_x86_64	2m 15s
Build wheels for manylinux_aarch64	8m 50s
Build wheels for manylinux_ppc64le	8m 26s
Build wheels for manylinux_s390x	9m 7s
Build wheels for manylinux_i686	2m 5s
Build wheels for win_amd6	5m 2s
Build wheels for win32	5m 24s
Build wheels for macos	3m 46s
Download Wheels	6s
publish	0s
	45m 43s

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