Add --stress-test command-line option #104

Job	Run time
linux_gcc_valgrind	1m 18s
linux_clang (ubuntu-latest, Debug)	3m 28s
linux_gcc_sanitizers	2m 19s
linux_clang (ubuntu-latest, Release)	1m 8s
linux_gcc (ubuntu-latest, Debug)	4m 51s
macos_clang (macos-latest, Debug)	5m 18s
linux_gcc (ubuntu-latest, Release)	2m 29s
macos_clang (macos-latest, Release)	1m 2s
windows_mingw64 (windows-latest, Debug)	5m 19s
windows_msvc2022	2m 12s
windows_mingw64 (windows-latest, Release)	2m 59s
	32m 23s

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