Use a hash table header and SIMD to speed up hash table operations (similar to [Swiss Tables](https://abseil.io/about/design/swisstables)). #743

Job	Run time
Build and test cmake:gcc9	28s
Build and test cmake:clang15	37s
Build and test cmake:clang15:asan	41s
Build and test cmake:clang15:tsan	45s
Build and test cmake:clang15:ubsan	53s
Build and test cmake:qemu-arm-neon-gcc	1m 4s
Build and test cmake-osx:clang	23s
Build and test cmake-osx:gcc	21s
Build and test cmake-win64:msvc-rel	1m 28s
Build and test cmake-win64:msvc-dbg	1m 25s
Build and test fuzz:clang15	30s
Build and test python3.10:clang15	1m 43s
Build and test python3.10-win	1m 3s
Build and test maven	33s
Build and test bazel:root	36s
Build and test bazel:go	1m 8s
Build and test bazel:java	18s
Build and test bazel:research	23s
Build and test bazel-osx:root	37s
Build and test bazel-osx:go	1m 15s
Build and test bazel-osx:java	20s
Build and test bazel-osx:research	37s
Build and test bazel-win:root	1m 56s
Build and test bazel-win:java	50s
Build and test bazel-win:research	1m 53s
	21m 47s

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