New grid object for structured grids #811

Job	Run time
mypy	56s
py3.13 \| macos \| integration tests	55s
py3.13 \| macos \| unit tests	54s
py3.13 \| ubuntu \| integration tests	55s
py3.13 \| ubuntu \| unit tests	54s
py3.13 \| windows \| integration tests	46s
py3.13 \| windows \| unit tests	51s
py3.11 \| ubuntu \| integration tests	53s
py3.11 \| ubuntu \| unit tests	54s
py3.12 \| ubuntu \| unit tests	52s
merge-test-artifacts	1s
	8m 51s

Provide feedback