New grid object for structured grids #809

Job	Run time
py3.13 \| macos \| unit tests	9m 42s
py3.13 \| macos \| integration tests	12m 54s
py3.13 \| ubuntu \| unit tests	10m 59s
py3.13 \| ubuntu \| integration tests	13m 17s
py3.13 \| windows \| unit tests	13m 46s
mypy	3m 33s
py3.13 \| windows \| integration tests	23m 30s
py3.11 \| ubuntu \| unit tests	11m 22s
py3.11 \| ubuntu \| integration tests	13m 24s
py3.12 \| ubuntu \| unit tests	12m 27s
merge-test-artifacts	0s
	2h 4m 54s

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