Rich contracts V2 - structs

[rossneilson]

In solidity we can pass tuples or structs as parameters so we need to support this in rich contracts.
This can be very simple as we will just reuse the existing structure we use for inputs but inside an object instead of as individual parameters.

Example: https://etherscan.io/address/0xe592427a0aece92de3edee1f18e0157c05861564#code

Also important to ensure we can reference variables inside the structs in action summaries

[rossneilson]

Similar to calldata type, just no function signature