Use a hash table header and SIMD to speed up hash table operations (similar to [Swiss Tables](https://abseil.io/about/design/swisstables)). #733

Job	Run time
Build and test cmake:gcc9	32s
Build and test cmake:clang15	42s
Build and test cmake:clang15:asan	53s
Build and test cmake:clang15:tsan	54s
Build and test cmake:clang15:ubsan	1m 0s
Build and test cmake:qemu-arm-neon-gcc	44s
Build and test cmake-osx:clang	44s
Build and test cmake-osx:gcc	41s
Build and test cmake-win64:msvc-rel	59s
Build and test cmake-win64:msvc-dbg	47s
Build and test fuzz:clang15	32s
Build and test python3.10:clang15	1m 47s
Build and test python3.10-win	1m 44s
Build and test maven	24s
Build and test bazel:root	35s
Build and test bazel:go	1m 5s
Build and test bazel:java	19s
Build and test bazel:research	22s
Build and test bazel-osx:root	1m 31s
Build and test bazel-osx:go	1m 47s
Build and test bazel-osx:java	28s
Build and test bazel-osx:research	1m 30s
Build and test bazel-win:root	1m 6s
Build and test bazel-win:java	29s
Build and test bazel-win:research	1m 18s
	22m 53s

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