Test parts of API with libFuzzer. #1908

Job	Run time
Build - MacOS (macos-12)	6m 30s
Build - MacOS (macos-13)	4m 15s
Build - Ubuntu (ubuntu-20.04, Debug, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF)	6m 8s
Build - Ubuntu (ubuntu-20.04, Release, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF)	6m 8s
Build - Ubuntu (ubuntu-22.04, Debug, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF)	6m 9s
Build - Ubuntu (ubuntu-22.04, Release, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF)	6m 5s
Build - Ubuntu (ubuntu-22.04, Release, clang, clang++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=OFF)	6m 8s
Build - Ubuntu (ubuntu-22.04, Release, gcc, g++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=ON)	6m 8s
Build - Ubuntu (ubuntu-22.04, Release, clang, clang++, -DVAL_USE_LIBBACKTRACE_BACKTRACE=ON)	5m 51s
Build - Ubuntu (ubuntu-20.04, Release, gcc-7, g++-7)	6m 9s
Build - Windows (windows-2019, Debug)	10m 36s
Build - Windows (windows-2019, Release)	10m 41s
Build - Windows (windows-2022, Debug)	10m 37s
Build - Windows (windows-2022, Release)	10m 3s
	1h 41m 28s

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