WIP: Add GPU aware MPI support in cannon algorithm #1470

Job	Run time
build-on-cuda (OPENMP=ON)	8m 16s
build-and-test (MPI=ON, OPENMP=ON, SMM=blas, openmpi)	4m 6s
build-on-opencl (OPENMP=ON, SMM=libxsmm)	8m 3s
build-and-test (MPI=ON, OPENMP=ON, SMM=blas, mpich)	3m 55s
pre-commit	1m 4s
build-and-test (MPI=ON, OPENMP=ON, SMM=libxsmm, openmpi)	3m 57s
build-on-rocm (OPENMP=ON)	3m 39s
build-and-test (MPI=ON, OPENMP=ON, SMM=libxsmm, mpich)	3m 46s
build-and-test (MPI=ON, OPENMP=OFF, SMM=blas, openmpi)	9m 12s
build-and-test (MPI=ON, OPENMP=OFF, SMM=blas, mpich)	9m 23s
build-and-test (MPI=ON, OPENMP=OFF, SMM=libxsmm, openmpi)	8m 55s
build-and-test (MPI=ON, OPENMP=OFF, SMM=libxsmm, mpich)	9m 11s
build-and-test (MPI=OFF, OPENMP=ON, SMM=blas, openmpi)	5m 14s
build-and-test (MPI=OFF, OPENMP=ON, SMM=libxsmm, openmpi)	5m 25s
build-and-test (MPI=OFF, OPENMP=OFF, SMM=blas, openmpi)	3m 26s
build-and-test (MPI=OFF, OPENMP=OFF, SMM=libxsmm, openmpi)	3m 10s
Combine & check coverage.	42s
	1h 31m 24s

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