New grid object for structured grids #796

Job	Run time
py3.13 \| macos \| unit tests	9m 29s
py3.13 \| macos \| integration tests	10m 43s
py3.13 \| ubuntu \| unit tests	10m 48s
py3.13 \| ubuntu \| integration tests	12m 30s
mypy	3m 32s
py3.13 \| windows \| unit tests	14m 1s
py3.13 \| windows \| integration tests	30m 35s
py3.11 \| ubuntu \| unit tests	11m 21s
py3.12 \| ubuntu \| unit tests	11m 17s
py3.11 \| ubuntu \| integration tests	13m 51s
merge-test-artifacts	0s
	2h 8m 7s

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