Enable scripting for subobjects such as triggers (#1237)

* WIP 1

* Cleanups

* Change how schema is appended in to urn

* Add comment and fix incorrect condition

* Add parent type name to support Views, etc.

src/Microsoft.SqlTools.ServiceLayer/Metadata/Contracts/ObjectMetadata.cs

@@ -30,6 +30,10 @@ namespace Microsoft.SqlTools.ServiceLayer.Metadata.Contracts
         public string Schema { get; set; }
 
         public string Name { get; set; }
+
+        public string ParentName { get; set; }
+
+        public string ParentTypeName { get; set; }
         
         public string Urn { get; set; }
     }