Add @mustCallSuper to component.render (#1011)

* Add @mustCallSuper to component.render

* fixing lint

* lint

* fixing

examples/lib/stories/utils/particles.dart

@@ -561,6 +561,7 @@ class TrafficLightComponent extends Component {
 
   @override
   void render(Canvas c) {
+    super.render(c);
     c.drawRect(rect, Paint()..color = currentColor);
   }
 

examples/lib/stories/utils/timer_component.dart

@@ -14,6 +14,7 @@ class RenderedTimeComponent extends TimerComponent {
 
   @override
   void render(Canvas canvas) {
+    super.render(canvas);
     textPaint.render(
       canvas,
       'Elapsed time: ${timer.current}',