Allow lifecycle events to be handled by remote services

The lifecycleClass attribute on @ServiceRequest and @ParticipantService needs to support remote services, such as EJB or Web services. This allows the events to be handled in a remote container.

We need to decide how and what context is passed to the remote service. Clearly the remote service needs some context to know what action to take. However, simply flowing the TX context may not be appropriate as the lifecycle methods will be invoked during termination of the protocol.