Build

Extract PQ4 kernels to includable headers in impl/pq_4bit/ #4376

Job	Run time
build-pull-request / Format	40s
build-pull-request / Linux x86_64 (cmake)	21m 52s
build-release	0s
build-pull-request / Linux x86_64 GPU w/ cuVS (cmake)	1h 45m 34s
build-pull-request / Linux x86_64 AVX512_SPR (cmake)	35m 5s
build-pull-request / Linux x86_64 AVX2 (cmake)	19m 42s
build-pull-request / Linux x86_64 GPU (cmake)	44m 41s
build-pull-request / Linux x86_64 w/ SVS (cmake)	22m 38s
build-pull-request / Linux x86_64 AVX512 (cmake)	35m 18s
build-pull-request / Linux x86_64 Dynamic Dispatch (cmake)	26m 42s
build-pull-request / Linux arm64 (conda)	1h 22m 35s
build-pull-request / Windows x86_64 (conda)	25m 15s
build-pull-request / Linux arm64 SVE (cmake)	21m 14s
build-pull-request / Linux x86_64 (conda)	25m 22s
build-pull-request / Linux arm64 Dynamic Dispatch (cmake)	18m 35s
build-pull-request / Index serialization backward compatibility / Conda Write -> CMake Read	24m 21s
build-pull-request / Index serialization backward compatibility / CMake Write -> Conda Read	24m 47s
	8h 54m 21s

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