Adding Cuda and Kokkos assembly. Added Device assembly to Landau operator. Added Kokkos test mat/ex5k.
Add WaitForKokkos to AIJKOKKOS
Add flops logging
Rename petscvec.hpp -> petscveckokkos.hpp
MatInode: set it to false when using device matrices
MATAIJ: few more fixes to KOKKOS and fixes to function composition
MATAIJKOKKOS: bugfixes
fix doc format
Add MATAIJKOKKOS
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