Stubbing out query execution settings

Adding a setting for batch separator.
Very small refactor to WorkspaceService that will create the basic
settings upon construction of the object.

src/Microsoft.SqlTools.ServiceLayer/SqlContext/SqlToolsSettings.cs

@@ -31,6 +31,8 @@ namespace Microsoft.SqlTools.ServiceLayer.SqlContext
                 this.ScriptAnalysis.Update(settings.ScriptAnalysis, workspaceRootPath);
             }
         }
+
+        public QueryExecutionSettings QueryExecutionSettings { get; set; }
     }
 
     /// <summary>