[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
Maybe we could add some caching for getting servlet handler as this can get expensive if there are lots of servlets registered in deployment. but given that this are not metrics is probably fine.