Add a benchmark for the Lengauer-Tarjan dominator tree algorithm #343

Job	Run time
macos (clang)	12m 18s
posix-cmake-install (ubuntu-20.04)	1m 31s
ubuntu-focal (g++-9)	20m 29s
posix-cmake-subdir (ubuntu-20.04)	1m 10s
posix-cmake-install (ubuntu-22.04)	1m 38s
ubuntu-focal (clang++-10)	18m 32s
windows_msvc_14_2 (msvc-14.2)	23m 21s
posix-cmake-subdir (ubuntu-22.04)	1m 39s
posix-cmake-install (ubuntu-24.04)	1m 40s
posix-cmake-subdir (ubuntu-24.04)	1m 1s
posix-cmake-install (macos-13)	2m 43s
posix-cmake-subdir (macos-13)	3m 21s
windows_msvc_14_3 (msvc-14.3)	24m 0s
posix-cmake-install (macos-14)	1m 27s
windows-cmake-install (windows-2019)	4m 40s
posix-cmake-subdir (macos-14)	1m 6s
posix-cmake-install (macos-15)	1m 34s
posix-cmake-subdir (macos-15)	1m 20s
windows-cmake-install (windows-2022)	4m 2s
windows-cmake-subdir (windows-2019)	2m 55s
windows-cmake-subdir (windows-2022)	2m 58s
	2h 13m 25s

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