Implement float math functions for two arrays #488

Job	Run time
format/nightly	13s
clippy/stable	15s
Pass MSRV values to other jobs	4s
cross_test/i686-unknown-linux-gnu/stable	1m 40s
miri	6m 57s
cross_test/s390x-unknown-linux-gnu/stable	6m 19s
docs/nightly	24s
nostd/thumbv6m-none-eabi/stable	21s
cargo-careful	1m 59s
tests/1.64.0	3m 51s
blas-msrv	41s
tests/stable	3m 1s
tests/beta	2m 38s
tests/nightly	3m 0s
conclusion	4s
	31m 27s

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