Add matrix_dot function #2030

Job	Run time
macos-latest: clang++ Release Threads	16m 25s
macos-latest: clang++ Release OneTBB	1m 46s
macos-latest: clang++ Release PaRSEC	1m 36s
ubuntu-20.04: /usr/bin/g++-9 Release Threads	37m 11s
ubuntu-20.04: /usr/bin/g++-9 Release OneTBB	2m 39s
ubuntu-20.04: /usr/bin/g++-9 Release PaRSEC	2m 55s
macos-latest: clang++ Debug Threads	20m 48s
macos-latest: clang++ Debug OneTBB	1m 39s
macos-latest: clang++ Debug PaRSEC	1m 40s
ubuntu-20.04: /usr/bin/g++-9 Debug Threads	48m 44s
ubuntu-20.04: /usr/bin/g++-9 Debug OneTBB	2m 28s
ubuntu-20.04: /usr/bin/g++-9 Debug PaRSEC	2m 45s
	2h 20m 36s

Provide feedback