HNSW-based vector index #14706

Job	Run time
rustfmt check	11s
python lint check	24s
sanity checks	12s
clang format	38s
rust build & test	27m 15s
shell test	13m 25s
clang tidy & clangd diagnostics check	6m 57s
generate binary dataset	2m 3s
code coverage	26m 28s
gcc build & test	8m 53s
clang build & test	5m 12s
apple clang build & test	2m 32s
msvc build & test	11m 12s
webassembly build & test	11m 0s
macos extension test	0s
clang build & test with page_size_log2=${{ matrix.page_size_log2 }}	0s
benchmark	0s
gcc build & test in-mem only with various vector size	0s
gcc build & test with asan	0s
linux extension test	0s
report benchmark result	0s
windows extension test	0s
	1h 56m 22s

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