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Kupyna: implemented hashing function #736

Job	Run time
minimal-versions / minimal-versions	52s
set-msrv / set-msrv	4s
build (1.85.0, thumbv7em-none-eabi)	24s
test (1.85.0)	49s
build (1.85.0, wasm32-unknown-unknown)	19s
test (stable)	1m 11s
build (stable, thumbv7em-none-eabi)	12s
build (stable, wasm32-unknown-unknown)	18s
	4m 9s

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