Add partition(similar to numpy.partition) #442

Job	Run time
Pass MSRV values to other jobs	3s
format/nightly	15s
clippy/stable	23s
cargo-careful	2m 1s
cross_test/i686-unknown-linux-gnu/stable	1m 44s
cross_test/s390x-unknown-linux-gnu/stable	6m 45s
docs/nightly	21s
nostd/thumbv6m-none-eabi/stable	21s
miri	8m 40s
tests/nightly	2m 48s
tests/beta	2m 40s
tests/stable	2m 42s
blas-msrv	51s
tests/1.64.0	3m 39s
conclusion	2s
	33m 15s

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