p521

ecdsa: remove `SignPrimitive`/`VerifyPrimitive` traits #913

Job	Run time
benches (stable)	1m 21s
build (1.73.0, thumbv7em-none-eabi)	23s
doc	59s
build (1.73.0, wasm32-unknown-unknown)	20s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	2m 10s
build (stable, thumbv7em-none-eabi)	19s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 43s
build (stable, wasm32-unknown-unknown)	21s
test (x86_64-unknown-linux-gnu, 1.73.0)	2m 37s
test (x86_64-unknown-linux-gnu, stable)	1m 18s
	11m 31s

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