feat: safetensors support — BF16 streaming indexer (#60) #85

Job	Run time
clippy/stable	25s
miri	24s
nostd/thumbv6m-none-eabi/stable	26s
docs/nightly	43s
cross_test/s390x-unknown-linux-gnu/stable	1m 32s
format/stable	23s
cargo-careful	32s
Pass MSRV values to other jobs	2s
cross_test/i686-unknown-linux-gnu/stable	1m 28s
native-backend/stable	39s
blas-msrv	54s
tests/beta	1m 19s
tests/stable	1m 18s
tests/1.64.0	1m 17s
conclusion	0s
	11m 22s

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