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Computes SHA256 on a binary and returns it as a binary
@spec sha256(String.t()) :: <<_::256>>
examples
iex> "6c7ab2f961a1bc3f13cdc08dc41c3f439adebd549a8ef1c089e81a5907376107" ...> |> Nostr.Crypto.sha256() <<0xab6a8f1d9e2b0333dff8e370ed6fdfe20b2e8008e045efb3fb3298c22f7569da::256>>