Test an app that uses messaging

## User story:
As a user of this test framework, I want to test an app that uses messaging (JMS, MP Reactive Messaging, or Kafka)

## Additional detail:
It is common for applications to communicate via some sort of messaging. Initially we could try and implement support for JMS or Kafka, but MP Reactive Messaging will hopefully gain a lot of traction once released and will influence the design of testing messaging apps. Wait until MP Reactive Messaging is stable/released before investigating this further.

Revisit the proposal after MP Reactive Messaging is stable, comparing the needs of JMS, MP Reactive Messaging, and Kafka applications. Define the supported messaging scenario and framework entry points before implementation; done means an application using the selected messaging technology can be tested reliably.

Written by the indexing model from the issue text.