Use a hash table header and SIMD to speed up hash table operations (similar to [Swiss Tables](https://abseil.io/about/design/swisstables)). #744

Job	Run time
Build and test cmake:gcc9	28s
Build and test cmake:clang15	34s
Build and test cmake:clang15:asan	48s
Build and test cmake:clang15:tsan	48s
Build and test cmake:clang15:ubsan	56s
Build and test cmake:qemu-arm-neon-gcc	1m 4s
Build and test cmake-osx:clang	21s
Build and test cmake-osx:gcc	21s
Build and test cmake-win64:msvc-rel	2m 0s
Build and test cmake-win64:msvc-dbg	56s
Build and test fuzz:clang15	28s
Build and test python3.10:clang15	1m 50s
Build and test python3.10-win	45s
Build and test maven	26s
Build and test bazel:root	35s
Build and test bazel:go	1m 4s
Build and test bazel:java	20s
Build and test bazel:research	22s
Build and test bazel-osx:root	38s
Build and test bazel-osx:go	1m 2s
Build and test bazel-osx:java	20s
Build and test bazel-osx:research	36s
Build and test bazel-win:root	1m 54s
Build and test bazel-win:java	29s
Build and test bazel-win:research	1m 52s
	20m 57s

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