REST-AT participant support framework should have associated quickstarts

JBTM-1365 introduced the RTS wildfly subsystem and an interface for simplifying participant registration into a REST-AT transaction by providing callbacks for prepare/commit/rollback. We need some quickstarts that show how to use it:

• a standalone example similar to https://github.com/jbosstm/quickstart/tree/master/rest-tx/service showing the difference between the two approaches to building services
• showing integration with wildfly
• one for recovery

If we want to split the work between engineers that would be fine.