k12

[WIP] blake2: integrate `blake2b_simd`/`blake2s_simd` crates #1312

Job	Run time
set-msrv / set-msrv	5s
build (1.85.0, wasm32-unknown-unknown)	53s
build (stable, wasm32-unknown-unknown)	6s
test (1.85.0)	16s
build (stable, thumbv7em-none-eabi)	53s
test (stable)	53s
build (1.85.0, thumbv7em-none-eabi)	52s
	3m 58s

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