implementation of md6 in pure rust #115

Job	Run time
minimal-versions	0s
set-msrv / set-msrv	4s
linux (x86_64-unknown-linux-gnu, 1.81.0)	36s
build (1.81.0, thumbv7em-none-eabi)	19s
linux (x86_64-unknown-linux-gnu, stable)	24s
build (1.81.0, wasm32-unknown-unknown)	25s
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)	26s
cross (stable, aarch64-unknown-linux-gnu, default)	37s
cross (stable, powerpc-unknown-linux-gnu, default)	42s
macos (1.81.0)	28s
build (stable, wasm32-unknown-unknown)	19s
macos (stable)	26s
build (stable, loongarch64-unknown-linux-gnu)	45s
windows (x86_64-pc-windows-gnu, 1.81.0)	59s
windows (x86_64-pc-windows-gnu, stable)	1m 53s
	9m 56s

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