[WFLY-3045] : Expose JAXRS deployments via the management API

Displaying JAXRS resources in deployments, showing paths and  methods.
Adding mappings to the deployment infos of servlets.

Jira: https://issues.jboss.org/browse/WFLY-3045
This whole method looks like quite heavy processing. 
Given that this only adds extra run time management view it should not impact deployment process but should do heavy lifting only when asked for.
So doing lots of this in read handler of metrics sounds as a good place to do it.
Otherwise we could also control this with "statistics-enabled"  flag for the subsystem similar that we have for many other subsystems.