fuzz: more complete fuzzing #472

Job	Run time
Build and test cmake:gcc9	56s
Build and test cmake:clang12	14s
Build and test cmake:clang12:asan	21s
Build and test cmake:clang12:tsan	21s
Build and test cmake:clang12:ubsan	17s
Build and test cmake:qemu-arm-neon-gcc	1m 26s
Build and test cmake-osx:clang	51s
Build and test cmake-osx:gcc	49s
Build and test cmake-win64:msvc2019-rel	1m 21s
Build and test cmake-win64:msvc2019-dbg	1m 14s
Build and test fuzz:clang12	33s
Build and test python39:clang12	18s
Build and test python39-win	54s
Build and test maven	55s
Build and test bazel:root	55s
Build and test bazel:go	1m 0s
Build and test bazel:java	3m 12s
Build and test bazel:js	4m 51s
Build and test bazel:research	33s
Build and test bazel-osx:root	1m 52s
Build and test bazel-osx:go	1m 49s
Build and test bazel-osx:java	4m 28s
Build and test bazel-osx:js	8m 6s
Build and test bazel-osx:research	1m 45s
Build and test bazel-win:root	1m 34s
Build and test bazel-win:java	6m 27s
Build and test bazel-win:research	1m 38s
	48m 40s

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