Create the mother of all contracts

[athei]

It would be massively helpful for Ul development to create an example contract that uses as much functionality as possible. I mean that from an input/output standpoint:

• Use a lot of different complicated nested input and ouput types
• Use debug printing
• Use revert
• Use trap

This list is not exhaustive. The contract doesn't need to make sense. Just something that exercises the limits of the UI.

cc @statictype

Would be a good issue for someone new.

[cmichi]

Once we have it, we should test if the call, initiate, etc. sub-commands of cargo-contract behave correctly with this contract.