async-icq demo controller chain implementation should live in this repo

[jtieri]

async-icq has the concept of a host chain (the chain where queries are received and processed) and a controller chain (the chain sending the query req and processing the ack). there is a demo that currently lives here but i think it would be more beneficial for app developers to have access to this demo in the ibc-apps repo. it would also make testing via an e2e test with ictest in this repo straightforward so that functionality for both the host and controller can be exercised in CI