Make a distinct storm-ras artifact

Storm 2.0.0 release page here suggest us to put storm-server as test scope for testing. But RAS packages are in storm-server package too, and we need it when we launch our topology. Some of RAS packages should be either integrated in storm-core or in a distinct package storm-ras, so that we do not have to put storm-server as compile test, which we do for now.