Add v4 pytest markers and TODO in documentation #572

Job	Run time
mypy	3m 27s
py3.13 \| macos \| integration tests	13m 54s
py3.13 \| macos \| unit tests	8m 43s
py3.13 \| ubuntu \| integration tests	31m 49s
py3.13 \| ubuntu \| unit tests	10m 2s
py3.13 \| windows \| integration tests	26m 5s
py3.13 \| windows \| unit tests	13m 50s
py3.10 \| ubuntu \| integration tests	14m 14s
py3.10 \| ubuntu \| unit tests	11m 8s
py3.11 \| ubuntu \| unit tests	10m 15s
py3.12 \| ubuntu \| unit tests	10m 42s
merge-test-artifacts	5s
	2h 34m 14s

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