feat: Add kernel callable dense LA solvers for small systems. #6895

Job	Run time
semantic_pull_request	4s
is_not_draft_pull_request	7s
if_not_unassigned_pull_request	7s
are_submodules_in_sync	12s
baseline_log	7s
code_coverage / build_test_deploy	45m 49s
Check code style / build_test_deploy	1m 16s
Check documentation / build_test_deploy	1m 4s
Ubuntu (20.04, gcc 10.5.0, open-mpi 4.0.3) - github codespaces / build_test_deploy	1m 48s
Ubuntu (20.04, gcc 9.4.0, open-mpi 4.0.3) / build_test_deploy	1m 52s
Ubuntu (22.04, clang 15.0.7, open-mpi 4.1.2) / build_test_deploy	4m 9s
Ubuntu (22.04, gcc 11.4.0, open-mpi 4.1.2) / build_test_deploy	5m 35s
Ubuntu debug (20.04, gcc 10.5.0, open-mpi 4.0.3) - github codespaces / build_test_deploy	1m 9s
Ubuntu CUDA (20.04, clang 10.0.0 + gcc 9.4.0, open-mpi 4.0.3, cuda-11.8.89) / build_test_deploy	11m 41s
Ubuntu (22.04, gcc 12.3.0, open-mpi 4.1.2) / build_test_deploy	4m 31s
Ubuntu CUDA debug (20.04, clang 10.0.0 + gcc 9.4.0, open-mpi 4.0.3, cuda-11.8.89) / build_test_deploy	4m 4s
run_integrated_tests	0s
check_that_all_jobs_succeeded	1s
	1h 23m 36s

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