implementation of md6 in pure rust #109

Job	Run time
minimal-versions	0s
set-msrv / set-msrv	3s
linux (x86_64-unknown-linux-gnu, 1.81.0)	41s
cross (1.81.0, aarch64-unknown-linux-gnu, default)	44s
linux (x86_64-unknown-linux-gnu, stable)	24s
build (1.81.0, thumbv7em-none-eabi)	21s
macos (1.81.0)	29s
cross (1.81.0, powerpc-unknown-linux-gnu, default)	44s
build (1.81.0, wasm32-unknown-unknown)	25s
macos (stable)	21s
cross (stable, aarch64-unknown-linux-gnu, default)	29s
build (1.81.0, loongarch64-unknown-linux-gnu)	18s
windows (x86_64-pc-windows-gnu, 1.81.0)	55s
cross (stable, powerpc-unknown-linux-gnu, default)	29s
build (stable, thumbv7em-none-eabi)	18s
windows (x86_64-pc-windows-gnu, stable)	1m 50s
build (stable, wasm32-unknown-unknown)	26s
build (stable, loongarch64-unknown-linux-gnu)	17s
	9m 14s

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