ecdsa

ecdsa: refactor field bytes encoding (#1388) #2728

Job	Run time
test (stable)	38s
test (1.85.0)	35s
no_std (wasm32-unknown-unknown, stable)	1m 9s
no_std (wasm32-unknown-unknown, 1.85.0)	1m 14s
no_std (thumbv7em-none-eabi, 1.85.0)	1m 19s
no_std (thumbv7em-none-eabi, stable)	1m 5s
	6m 0s

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