Scaffold IBC tests using framework defined in https://github.com/cosmos/ibc-go/tree/main/testing

[dshulyak]

It removes a lot of boilerplate for IBC state management that otherwise we will have to implement ourselves. Also allows using 2-chain setup in tests.

Our current codebase is using a module from cosmos-sdk. It also has a framework for testing, but lacks a capability to swap an application that is used for testing.