Intrduce a type to group bundle addresses

[hackaugusto]

Add a new class to group smart contract addresses know to work together. And return an instance of this class instead of a dictionary in get_contracts_deployment_info. The goal here is to have proper type checking for the addresses.

If there are ABI breakage, a new class should be introduced (this will break the state linting on Raiden and force us to fix the corresponding proxies). I

[pirapira]

The said dictionary is somewhat typed. This issue boils down to giving a more precise type.