refactor(DA): Replace hashing function

[LHerskind]

The hashing function used for DA related tasks are currently sha256 (truncated). For anything but the cross-chain messages which needs to be computable on the base-layer (evm), we don't really need to use sha256. Instead we can use something much more performant in a snark setting such as Poseidon when actually using a different data availability solution than just calldata 🤷