sha3

sha2: provide support for `spki::AlgorithmIdentifier` #1144

Job	Run time
minimal-versions / minimal-versions	3m 20s
set-msrv / set-msrv	2s
test (1.71.0)	3m 53s
cross (1.71.0, aarch64-unknown-linux-gnu, default)	1m 22s
test (stable)	3m 40s
cross (1.71.0, powerpc-unknown-linux-gnu, default)	1m 43s
cross (stable, aarch64-unknown-linux-gnu, default)	1m 1s
cross (stable, powerpc-unknown-linux-gnu, default)	1m 21s
build (1.71.0, thumbv7em-none-eabi)	21s
build (1.71.0, wasm32-unknown-unknown)	22s
build (stable, thumbv7em-none-eabi)	14s
build (stable, wasm32-unknown-unknown)	19s
	17m 38s

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