New grid object for structured grids #810

Job	Run time
mypy	3m 32s
py3.13 \| macos \| unit tests	6m 9s
py3.13 \| macos \| integration tests	6m 9s
py3.13 \| ubuntu \| unit tests	6m 6s
py3.13 \| ubuntu \| integration tests	6m 9s
py3.13 \| windows \| unit tests	5m 54s
py3.13 \| windows \| integration tests	5m 54s
py3.11 \| ubuntu \| unit tests	6m 8s
py3.11 \| ubuntu \| integration tests	6m 8s
py3.12 \| ubuntu \| unit tests	6m 8s
merge-test-artifacts	1s
	58m 18s

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