Add a matrix-vector testing for distributed case

src/z_spm.h

src/z_spm_genrhs.c

tests/CMakeLists.txt

tests/spm_dist_genrhs_tests.c

tests/spm_dist_matvec_tests.c

tests/spm_dist_norm_tests.c

tests/spm_tests.h

tests/z_spm_tests.c