Make serialization methods consistent (#674) #1240

Job	Run time
build with default features	31s
build with no_std (ristretto255)	19s
build with MSRV (1.66.1)	2m 10s
actionlint	6s
build with no_std (ed25519)	18s
Clippy	27s
build with no_std (p256)	20s
Check Rust doc	23s
Rustfmt	10s
build with no_std (secp256k1)	20s
Check if automatically generated code is up to date	11s
build with no_std (rerandomized)	18s
test on beta	1m 59s
test all features combinations	26m 41s
	34m 13s

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