Webgl points layer / allow disabling hit detection

Having hit detection enabled has an overhead as it means
continously generating additional render instructions and rendering
to an offscreen canvas

examples/webgl-points-layer.js

@@ -117,7 +117,8 @@ function refreshLayer(newStyle) {
   const previousLayer = pointsLayer;
   pointsLayer = new WebGLPointsLayer({
     source: vectorSource,
-    style: newStyle
+    style: newStyle,
+    disableHitDetection: true
   });
   map.addLayer(pointsLayer);