New grid object for structured grids #812

Job	Run time
py3.13 \| macos \| integration tests	10m 50s
py3.13 \| macos \| unit tests	8m 31s
py3.13 \| ubuntu \| integration tests	13m 28s
mypy	3m 48s
py3.13 \| ubuntu \| unit tests	11m 40s
py3.13 \| windows \| integration tests	22m 31s
py3.13 \| windows \| unit tests	12m 39s
py3.11 \| ubuntu \| integration tests	14m 15s
py3.11 \| ubuntu \| unit tests	12m 9s
py3.12 \| ubuntu \| unit tests	11m 38s
merge-test-artifacts	0s
	2h 1m 29s

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