Test parts of API with libFuzzer. #2071

Job	Run time
Build - Ubuntu (ubuntu-20.04, Debug, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF, -DUMF_ENABLE...	13m 7s
Build - Ubuntu (ubuntu-20.04, Debug, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF, -DUMF_ENABLE...	9m 22s
Build - Ubuntu (ubuntu-20.04, Release, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF, -DUMF_ENAB...	9m 58s
Build - Ubuntu (ubuntu-20.04, Release, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF, -DUMF_ENAB...	12m 3s
Build - Ubuntu (ubuntu-22.04, Debug, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF, -DUMF_ENABLE...	10m 24s
Build - Ubuntu (ubuntu-22.04, Debug, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF, -DUMF_ENABLE...	11m 54s
Build - Ubuntu (ubuntu-22.04, Release, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF, -DUMF_ENAB...	10m 33s
Build - Ubuntu (ubuntu-22.04, Release, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF, -DUMF_ENAB...	13m 50s
Build - Ubuntu (ubuntu-22.04, Release, clang, clang++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF, ON)	33m 5s
Build - Ubuntu (ubuntu-22.04, Release, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=ON)	10m 35s
Build - Ubuntu (ubuntu-22.04, Release, clang, clang++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=ON, ON)	30m 39s
Build - Ubuntu (ubuntu-20.04, Release, gcc-7, g++-7)	14m 30s
Build - Windows (windows-2019, Debug)	8m 38s
Build - Windows (windows-2019, Release)	14m 13s
Build - Windows (windows-2022, Debug)	11m 30s
Build - Windows (windows-2022, Release)	13m 28s
Build - MacOS (macos-12)	6m 26s
Build - MacOS (macos-13)	7m 50s
	4h 2m 5s

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