p521

ecdsa: remove `SignPrimitive`/`VerifyPrimitive` traits (#1020) #915

Job	Run time
benches (stable)	1m 15s
build (1.73.0, thumbv7em-none-eabi)	22s
build (1.73.0, wasm32-unknown-unknown)	21s
build (stable, thumbv7em-none-eabi)	13s
build (stable, wasm32-unknown-unknown)	20s
doc	1m 2s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	1m 54s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 46s
test (x86_64-unknown-linux-gnu, 1.73.0)	1m 26s
test (x86_64-unknown-linux-gnu, stable)	1m 22s
	10m 1s

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