md5

feat: expose MD5 compression function #1166

Job	Run time
minimal-versions / minimal-versions	45s
set-msrv / set-msrv	3s
test (1.85.0)	35s
test (stable)	46s
build (1.85.0, loongarch64-unknown-linux-gnu)	28s
build (1.85.0, thumbv7em-none-eabi)	24s
build (stable, thumbv7em-none-eabi)	26s
build (stable, wasm32-unknown-unknown)	22s
build (stable, loongarch64-unknown-linux-gnu)	39s
build (1.85.0, wasm32-unknown-unknown)	26s
	4m 54s

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