sha2

Implement ZeroizeOnDrop for SHA 1..=2 and Blake2 #981

Job	Run time
loongarch64_asm	16s
test-msrv	4m 12s
minimal-versions / minimal-versions	3m 41s
set-msrv / set-msrv	4s
windows (1.59.0, x86_64-pc-windows-gnu)	5m 16s
windows (stable, x86_64-pc-windows-gnu)	52s
build (1.59, thumbv7em-none-eabi)	4m 1s
cross (1.59.0, aarch64-unknown-linux-gnu, default)	4m 16s
build (1.59, wasm32-unknown-unknown)	4m 16s
linux (i686-unknown-linux-gnu, 1.59.0, sudo apt update && sudo apt install gcc-multilib)	8m 14s
cross (1.59.0, powerpc-unknown-linux-gnu, default)	4m 22s
build (stable, thumbv7em-none-eabi)	21s
macos (1.59.0)	6m 37s
cross (stable, aarch64-unknown-linux-gnu, default)	48s
linux (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	3m 12s
build (stable, wasm32-unknown-unknown)	25s
macos (stable)	49s
cross (stable, powerpc-unknown-linux-gnu, default)	55s
linux (x86_64-unknown-linux-gnu, 1.59.0)	8m 19s
cross (stable, aarch64-unknown-linux-gnu, asm)	47s
linux (x86_64-unknown-linux-gnu, stable)	2m 50s
	1h 4m 33s

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