[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
Don't duplicate whole AbstractMetricsHandler code.
just modify AbstractMetricsHandler#handle method to have extra parameter ServletInfo servletInfo
and then just inline implement handle() method and not whole abstract class, you duplicated 95% of whole class.