Add `hash2curve` crate #2

Job	Run time
test (1.85.0)	29s
build (1.85.0, wasm32-unknown-unknown)	27s
build (stable, thumbv7em-none-eabi)	31s
build (stable, wasm32-unknown-unknown)	25s
doc	40s
test (stable)	33s
build (1.85.0, thumbv7em-none-eabi)	28s
	3m 33s

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