Support CoseKey field ordering #232

Job	Run time
examples (stable)	28s
test (stable)	15s
Build for a no_std target (stable)	12s
build (stable)	14s
examples (beta)	17s
test (beta)	21s
Build for a no_std target (beta)	19s
examples (nightly-2023-04-01)	24s
build (beta)	19s
test (nightly-2023-04-01)	35s
Build for a no_std target (nightly-2023-04-01)	26s
build (nightly-2023-04-01)	25s
clippy	13s
coverage	2m 36s
deny	4m 20s
doc	9s
formatting	1m 5s
Rust 1.56.0 MSRV	2m 10s
udeps	4m 24s
Rust 1.57.0 MSRV	2m 8s
	21m 20s

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