Adding more background to v4 development on the v4-docpage #561

Job	Run time
mypy	3m 16s
py3.13 \| macos \| integration tests	14m 55s
py3.13 \| macos \| unit tests	9m 2s
py3.13 \| ubuntu \| integration tests	17m 10s
py3.13 \| ubuntu \| unit tests	13m 25s
py3.13 \| windows \| integration tests	49m 9s
py3.13 \| windows \| unit tests	21m 42s
py3.10 \| ubuntu \| integration tests	17m 29s
py3.10 \| ubuntu \| unit tests	13m 29s
py3.11 \| ubuntu \| unit tests	13m 15s
py3.12 \| ubuntu \| unit tests	14m 14s
merge-test-artifacts	4s
	3h 7m 10s

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