Background

The goal here is to set up the necessary definitions and functions to scaffold the initial version of the ICA app by following IBC-go designs as our reference and starting point. To consider this task complete, we should:

1. Define all the essential domain types and ensure they can be properly converted to and from ICA proto types.
2. Create an initial abstraction that establishes the required contexts and handlers for each of the controller and host chains.

This should allow us to evaluate the abstractions on the Basecoin-rs side, which serves as our testing environment.