feat: safetensors support — BF16 streaming indexer #84

Job	Run time
clippy/stable	22s
native-backend/stable	38s
cross_test/s390x-unknown-linux-gnu/stable	1m 33s
format/stable	24s
Pass MSRV values to other jobs	4s
nostd/thumbv6m-none-eabi/stable	25s
cross_test/i686-unknown-linux-gnu/stable	1m 35s
miri	0s
docs/nightly	0s
cargo-careful	0s
blas-msrv	50s
tests/1.64.0	1m 21s
tests/stable	1m 21s
tests/beta	1m 25s
conclusion	0s
	9m 58s

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