Faiss GPU: bfloat16 brute-force kNN support (#4014) #1641

Job	Run time
Format	51s
Linux arm64 packages	0s
Linux x86_64 GPU packages (CUDA 11.4.4)	0s
Linux x86_64 (cmake)	15m 26s
Linux x86_64 GPU packages (CUDA 12.1.1)	0s
Linux x86_64 GPU w/ RAFT packages (CUDA 11.8.0)	0s
Linux x86_64 GPU w/ RAFT packages (CUDA 12.1.1)	0s
Linux x86_64 packages	0s
OSX arm64 packages	0s
Windows x86_64 packages	0s
Linux x86_64 AVX512 (cmake)	23m 46s
Linux arm64 SVE (cmake)	14m 52s
Linux x86_64 GPU (cmake)	37m 2s
Linux x86_64 AVX2 (cmake)	15m 45s
Linux x86_64 (conda)	16m 36s
Linux x86_64 GPU w/ ROCm (cmake)	7m 8s
Linux x86_64 GPU w/ RAFT (cmake)	1h 36m 35s
Linux arm64 (conda)	11m 15s
Windows x86_64 (conda)	52m 18s
	4h 51m 34s

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