std::hash::keccak256 cannot hash more than a single block (136 bytes input)

[TomAFrench]

std::hash::keccak256 is currently written implying that it will support inputs of multiple blocks however attempting to provide inputs in excess of 136 bytes will fail as we attempt to write them into an array with the capacity to hold only a single block.

We should add testing for multi-block hash inputs and fix this issue.

[Savio-Sou]

Also reported on Noir Discord: https://discord.com/channels/1113924620781883405/1292163282345656320/1292163282345656320