fsb

Kupyna: implemented hashing function #751

Job	Run time
set-msrv / set-msrv	2s
minimal-versions / minimal-versions	44s
test (1.85.0)	2m 34s
build (1.85.0, thumbv7em-none-eabi)	28s
test (stable)	40s
build (1.85.0, wasm32-unknown-unknown)	16s
build (stable, thumbv7em-none-eabi)	22s
build (stable, wasm32-unknown-unknown)	39s
	5m 45s

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