tests

Merge imio in as `image_io` submodule #189

Job	Run time
Check Linting	12s
Check Manifest	21s
ubuntu-latest py3.9	1m 8s
ubuntu-latest py3.10	1m 9s
ubuntu-latest py3.11	1m 3s
macos-latest py3.11	1m 5s
windows-latest py3.11	1m 14s
Build source distribution	0s
Publish build distributions	0s
	6m 12s

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