bp384: add sqrt (#918) #57

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 27s
build (1.65.0, wasm32-unknown-unknown)	1m 31s
build (stable, thumbv7em-none-eabi)	25s
build (stable, wasm32-unknown-unknown)	56s
doc	25s
cross (armv7-unknown-linux-gnueabihf, 1.65.0)	3m 0s
cross (armv7-unknown-linux-gnueabihf, stable)	2m 19s
cross (aarch64-unknown-linux-gnu, 1.65.0)	3m 30s
cross (aarch64-unknown-linux-gnu, stable)	1m 47s
cross (powerpc-unknown-linux-gnu, 1.65.0)	3m 54s
cross (powerpc-unknown-linux-gnu, stable)	2m 22s
test (i686-unknown-linux-gnu, 1.65.0, sudo apt update && sudo apt install gcc-multilib)	3m 15s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	2m 38s
test (x86_64-unknown-linux-gnu, 1.65.0)	3m 0s
test (x86_64-unknown-linux-gnu, stable)	1m 49s
	32m 18s

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