k256+primeorder: add `BatchInvert` and `BatchNormalize` impls (#971) #146

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	3m 38s
build (1.65.0, wasm32-unknown-unknown)	3m 37s
build (stable, thumbv7em-none-eabi)	11s
build (stable, wasm32-unknown-unknown)	39s
cross (armv7-unknown-linux-gnueabihf, 1.65.0)	4m 40s
cross (armv7-unknown-linux-gnueabihf, stable)	1m 8s
cross (aarch64-unknown-linux-gnu, 1.65.0)	5m 1s
doc	20s
cross (aarch64-unknown-linux-gnu, stable)	1m 13s
cross (powerpc-unknown-linux-gnu, 1.65.0)	4m 41s
test (i686-unknown-linux-gnu, 1.65.0, sudo apt update && sudo apt install gcc-multilib)	4m 50s
cross (powerpc-unknown-linux-gnu, stable)	1m 15s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 11s
test (x86_64-unknown-linux-gnu, 1.65.0)	4m 25s
test (x86_64-unknown-linux-gnu, stable)	54s
	37m 43s

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