Faiss GPU: bfloat16 brute-force kNN support (#4014) #1658

Job	Run time
Linux x86_64 (cmake)	15m 22s
Format	32s
Linux x86_64 GPU packages (CUDA 12.1.1)	0s
Linux x86_64 GPU packages (CUDA 11.4.4)	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
Linux arm64 packages	0s
OSX arm64 packages	0s
Windows x86_64 packages	0s
Linux x86_64 AVX2 (cmake)	15m 2s
Linux x86_64 AVX512 (cmake)	24m 9s
Linux arm64 (conda)	10m 54s
Linux arm64 SVE (cmake)	14m 20s
Linux x86_64 GPU (cmake)	36m 58s
Linux x86_64 GPU w/ RAFT (cmake)	1h 34m 16s
Linux x86_64 GPU w/ ROCm (cmake)	21m 19s
Windows x86_64 (conda)	48m 26s
Linux x86_64 (conda)	16m 11s
	4h 57m 29s

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