Generalise adjacency list storage #39398

Job	Run time
Lint	19s
Build and publish docs	6m 33s
Build and test	22m 48s
Build and test (linux-gnu-real64-64, ghcr.io/fenics/test-env:current-openmpi)	12m 43s
Build and test (linux-gnu-complex128-64, ghcr.io/fenics/test-env:current-openmpi)	14m 5s
Build and test (linux-gnu-real64-32, ghcr.io/fenics/test-env:current-openmpi)	13m 3s
Build and test (linux-gnu-complex128-32, ghcr.io/fenics/test-env:current-openmpi)	14m 4s
Build and test (linux-gnu-real32-32, ghcr.io/fenics/test-env:current-openmpi)	12m 8s
Build and test (linux-gnu-complex128-32, ghcr.io/fenics/test-env:current-mpich)	14m 11s
Build and test (linux-gnu-real64-32, ghcr.io/fenics/test-env:current-mpich)	12m 54s
Build and test (linux-gnu-complex64-32, ghcr.io/fenics/test-env:current-openmpi)	12m 59s
	2h 15m 47s

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