Matrix Multiplication example using MdSpan #5843

Job	Run time
clang-format	26s
linux_clang-14_cuda-11.2_debug_analysis	16m 56s
windows_cl-2022_debug_analysis	2h 32m 29s
macos_xcode-14.2_debug_analysis	34m 20s
linux_gcc-12_debug_analysis	18m 43s
macos_xcode-14.2_release	23m 12s
macos_xcode-14.3.1_debug	15m 48s
windows_cl-2022_release	2h 29m 57s
windows_cl-2022_debug	2h 26m 59s
linux_gcc-9_debug	18m 25s
linux_gcc-12_release_c++20	16m 55s
linux_gcc-13_debug	14m 26s
linux_clang-10_release	12m 56s
linux_clang-12_release	35m 34s
linux_clang-13_debug	11m 38s
linux_clang-16_debug_ubsan	14m 40s
linux_clang-16_debug_tsan	12m 53s
	11h 36m 17s

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