Spatial slip interpolation #1322

Job	Run time
py3.11 \| ubuntu \| unit tests	2m 30s
py3.12 \| ubuntu \| unit tests	2m 30s
py${{ matrix.python-version }} \| ${{ matrix.os }} \| integration tests	-1s
mypy	0s
merge-test-artifacts	1s
	5m 0s

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