ecdsa: remove `SignPrimitive`/`VerifyPrimitive` traits (#1020) #1304

Job	Run time
build (1.73.0, thumbv7em-none-eabi)	33s
doc	52s
build (1.73.0, wasm32-unknown-unknown)	29s
test (1.73.0)	35s
build (stable, thumbv7em-none-eabi)	24s
test (stable)	36s
build (stable, wasm32-unknown-unknown)	33s
	4m 2s

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