Edit data schema and SQLAuth support (#362)

- Fix non-dbo schema support, adding in specific parameter for schema. If this isn't specified, the code will still fall back to splitting up the objectName if it's a multi-part identifier. This ensures that input from action bar or CLI scenarios can still work since we'll accept multi-part names there
- Fix failure to edit data on Azure. This was failing as the SMO query to get the table info failed when cloning SqlConnection. In .Net Core it currently loses the passwor unless PersistSecurity = true.
- Fix bug in error reporting where ID and Method were switched. This caused bad breaks and was caught during integration testing

src/Microsoft.SqlTools.ServiceLayer/EditData/Contracts/EditInitializeRequest.cs

@@ -22,6 +22,11 @@ namespace Microsoft.SqlTools.ServiceLayer.EditData.Contracts
         /// </summary>
         public string ObjectName { get; set; }
 
+        /// <summary>
+        /// The schema for the object to use 
+        /// </summary>
+        public string SchemaName { get; set; }
+
         /// <summary>
         /// The type of the object to use for generating an edit script
         /// </summary>