Provide a MessageCorrelationBuilder.correlateAll() operation

We discussed this some time ago with Bernd Rücker via e-Mail and got the Statement that this might be a useful Feature.

Especially we could use it ;)

This pull request is an implementation proposal for consideration.

It doesn't have any Unit tests yet (due to lack of time). But we might find the time to add some, if Camunda says, that the Feature will be taken to the next release.