New grid object for structured grids #795

Job	Run time
py3.13 \| macos \| integration tests	12m 51s
py3.13 \| macos \| unit tests	10m 43s
py3.13 \| ubuntu \| integration tests	12m 49s
mypy	3m 37s
py3.13 \| ubuntu \| unit tests	12m 29s
py3.13 \| windows \| integration tests	12m 42s
py3.13 \| windows \| unit tests	12m 43s
py3.11 \| ubuntu \| integration tests	12m 50s
py3.11 \| ubuntu \| unit tests	12m 17s
py3.12 \| ubuntu \| unit tests	12m 3s
merge-test-artifacts	1s
	1h 55m 5s

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