Add a Landau collision operator, based on DMPlex and PetscFE, that uses p4est. It uses the new Kokkos interface and has a separate Cuda implementation. This could be deployed as 3rd party library, bu

Add a Landau collision operator, based on DMPlex and PetscFE, that uses p4est. It uses the new Kokkos interface and has a separate Cuda implementation. This could be deployed as 3rd party library, but this is easier to deploy to ECP, among other apps.

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