added time to interactive metrics, refactored metrics to use traits

changed task macro to take pipeline info

components/script/task_source/file_reading.rs

@@ -30,6 +30,7 @@ impl TaskSource for FileReadingTaskSource {
         self.0.send(CommonScriptMsg::Task(
             ScriptThreadEventCategory::FileRead,
             Box::new(canceller.wrap_task(task)),
+            None    //TODO
         ))
     }
 }