p224

Add `EcdsaCurve` trait impls #547

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	33s
doc	1m 0s
build (1.73.0, wasm32-unknown-unknown)	30s
build (stable, thumbv7em-none-eabi)	29s
build (stable, wasm32-unknown-unknown)	28s
test (i686-unknown-linux-gnu, 1.73.0, sudo apt update && sudo apt install gcc-multilib)	1m 4s
test (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	59s
test (x86_64-unknown-linux-gnu, 1.73.0)	40s
test (x86_64-unknown-linux-gnu, stable)	44s
	6m 27s

Provide feedback