implementation of md6 in pure rust #114

Job	Run time
minimal-versions	0s
set-msrv / set-msrv	3s
build (1.81.0, thumbv7em-none-eabi)	18s
linux (x86_64-unknown-linux-gnu, 1.81.0)	42s
build (1.81.0, wasm32-unknown-unknown)	20s
linux (x86_64-unknown-linux-gnu, stable)	30s
cross (1.81.0, aarch64-unknown-linux-gnu, default)	37s
build (1.81.0, loongarch64-unknown-linux-gnu)	19s
cross (1.81.0, powerpc-unknown-linux-gnu, default)	37s
build (stable, thumbv7em-none-eabi)	13s
cross (stable, aarch64-unknown-linux-gnu, default)	55s
build (stable, wasm32-unknown-unknown)	30s
macos (1.81.0)	27s
cross (stable, powerpc-unknown-linux-gnu, default)	29s
build (stable, loongarch64-unknown-linux-gnu)	25s
macos (stable)	22s
windows (x86_64-pc-windows-gnu, 1.81.0)	1m 6s
windows (x86_64-pc-windows-gnu, stable)	2m 30s
	10m 23s

Provide feedback