Test Hermes' async CCQ functionality

[seanchen1991]

Background

It's currently not clear whether Hermes is to relay async Cross-Chain Queries; this is something that needs to be verified.

Once it has been confirmed, we should add CI tests to ensure this functionality works as expected.

[romac]

Let's perhaps test this against https://github.com/notional-labs/nursery /cc @ljoss17