We should add hash wrappers as well for all Sui/Narwhal used functions

[kchalkias]

This will help to avoid surprises in Sui or Narwhal re using different sha2/sha3/keccak deps in different places. Ideally we should control every crypto algorithm in fastcrypto. After having these wrappers, we should update both Narwhal and Sui repos by invoking fastcrypto's api.

I was thinking that the same applies for base64, but let's wait for this, as Rust's popular base64 crate is working on the malleability fix.

[jonas-lj]

@kchalkias Do we also need BLAKE2? It's used a few places in fastcrypto, but only in tests where it could be replaced with any other hash function.

[kchalkias]

@jonas-lj we'll need all major hash functions currently used indeed.

[jonas-lj]

The hash functions are added and there's an issue on the SUI repo to add them there (MystenLabs/sui#4760), so could we close this issue now?