Be able to import and export messages from a file to and from a broker

User Story:

As a System Administrator

I would like to be able load messages to/from a broker using an XML file

So that I can import or export messages that may have been lost or created in a different system to a specific queue

More info:

This is basically taking a XML file that follows a defined format and upload them to a specific queue or address in the broker, it also supports doing the reverse and downloading messages into an XML file.

Upstream PR: https://issues.apache.org/jira/browse/ARTEMIS-1840

Some testing covered by artemis- cli/src/test/java/org/apache/activemq/cli/test/MessageSerializerTest however may still need integration test.

Minimal docs upstream just whats covered by the cli help command:

./bin/artemis help data consumer

and

./bin/artemis help data producer

Altho this is generic and this functionality only covers what has been added by the --data flag which points to a XML file. We need to pride the format of the xml file to docs.