seth sig / seth calldata: handle tuple types

The abi parser in hevm does not currenlty support tuple types ([ref](https://github.com/dapphub/dapptools/blob/1729e1d87319fc0112e18536d9bc600cb1f3f623/src/hevm/src/EVM/ABI.hs#L511)).

We need to implement this to be able to handle tuple types for `seth sig` and `seth calldata`.