Use a hash table header and SIMD to speed up hash table operations (similar to [Swiss Tables](https://abseil.io/about/design/swisstables)). #738

Job	Run time
Build and test cmake:gcc9	12s
Build and test cmake:clang15	37s
Build and test cmake:clang15:asan	24s
Build and test cmake:clang15:tsan	19s
Build and test cmake:clang15:ubsan	17s
Build and test cmake:qemu-arm-neon-gcc	25s
Build and test cmake-osx:clang	15s
Build and test cmake-osx:gcc	14s
Build and test cmake-win64:msvc-rel	48s
Build and test cmake-win64:msvc-dbg	54s
Build and test fuzz:clang15	43s
Build and test python3.10:clang15	27s
Build and test python3.10-win	48s
Build and test maven	34s
Build and test bazel:root	20s
Build and test bazel:go	31s
Build and test bazel:java	20s
Build and test bazel:research	23s
Build and test bazel-osx:root	32s
Build and test bazel-osx:go	36s
Build and test bazel-osx:java	22s
Build and test bazel-osx:research	35s
Build and test bazel-win:root	1m 39s
Build and test bazel-win:java	1m 2s
Build and test bazel-win:research	2m 33s
	15m 50s

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