Use a hash table header and SIMD to speed up hash table operations (similar to [Swiss Tables](https://abseil.io/about/design/swisstables)). #732

Job	Run time
Build and test cmake:gcc9	30s
Build and test cmake:clang15	46s
Build and test cmake:clang15:asan	53s
Build and test cmake:clang15:tsan	1m 1s
Build and test cmake:clang15:ubsan	1m 1s
Build and test cmake:qemu-arm-neon-gcc	18s
Build and test cmake-osx:clang	42s
Build and test cmake-osx:gcc	1m 2s
Build and test cmake-win64:msvc-rel	42s
Build and test cmake-win64:msvc-dbg	58s
Build and test fuzz:clang15	29s
Build and test python3.10:clang15	1m 55s
Build and test python3.10-win	44s
Build and test maven	28s
Build and test bazel:root	26s
Build and test bazel:go	29s
Build and test bazel:java	22s
Build and test bazel:research	36s
Build and test bazel-osx:root	1m 26s
Build and test bazel-osx:go	1m 38s
Build and test bazel-osx:java	31s
Build and test bazel-osx:research	1m 22s
Build and test bazel-win:root	1m 42s
Build and test bazel-win:java	30s
Build and test bazel-win:research	1m 13s
	21m 44s

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