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[WIP] MD6 implementation #880

Job	Run time
cross (1.51.0, aarch64-unknown-linux-gnu, default)	3m 56s
loongarch64_asm	28s
cross (1.51.0, powerpc-unknown-linux-gnu, default)	3m 58s
test-msrv	10s
cross (stable, aarch64-unknown-linux-gnu, default)	55s
cross (stable, powerpc-unknown-linux-gnu, default)	50s
minimal-versions / minimal-versions	1m 48s
set-msrv / set-msrv	2s
windows (x86_64-pc-windows-gnu, stable)	1m 10s
linux (x86_64-unknown-linux-gnu, 1.57.0)	4m 1s
macos (1.57.0)	8m 25s
linux (x86_64-unknown-linux-gnu, stable)	1m 50s
build (1.57.0, thumbv7em-none-eabi)	4m 28s
macos (stable)	1m 28s
build (1.57.0, wasm32-unknown-unknown)	4m 13s
build (stable, thumbv7em-none-eabi)	32s
build (stable, wasm32-unknown-unknown)	28s
	38m 42s

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