Make code prettier

This updates ESLint and our shared eslint-config-openlayers to use Prettier.  Most formatting changes were automatically applied with this:

    npm run lint -- --fix

A few manual changes were required:

 * In `examples/offscreen-canvas.js`, the `//eslint-disable-line` comment needed to be moved to the appropriate line to disable the error about the `'worker-loader!./offscreen-canvas.worker.js'` import.
 * In `examples/webpack/exapmle-builder.js`, spaces could not be added after a couple `function`s for some reason.  While editing this, I reworked `ExampleBuilder` to be a class.
 * In `src/ol/format/WMSGetFeatureInfo.js`, the `// @ts-ignore` comment needed to be moved down one line so it applied to the `parsersNS` argument.

examples/wms-time.js

@@ -1,10 +1,10 @@
 import Map from '../src/ol/Map.js';
+import Stamen from '../src/ol/source/Stamen.js';
+import TileLayer from '../src/ol/layer/Tile.js';
+import TileWMS from '../src/ol/source/TileWMS.js';
 import View from '../src/ol/View.js';
 import {getCenter} from '../src/ol/extent.js';
-import TileLayer from '../src/ol/layer/Tile.js';
 import {transformExtent} from '../src/ol/proj.js';
-import Stamen from '../src/ol/source/Stamen.js';
-import TileWMS from '../src/ol/source/TileWMS.js';
 
 function threeHoursAgo() {
   return new Date(Math.round(Date.now() / 3600000) * 3600000 - 3600000 * 3);
@@ -18,25 +18,25 @@ let animationId = null;
 const layers = [
   new TileLayer({
     source: new Stamen({
-      layer: 'terrain'
-    })
+      layer: 'terrain',
+    }),
   }),
   new TileLayer({
     extent: extent,
     source: new TileWMS({
       attributions: ['Iowa State University'],
       url: 'https://mesonet.agron.iastate.edu/cgi-bin/wms/nexrad/n0r-t.cgi',
-      params: {'LAYERS': 'nexrad-n0r-wmst'}
-    })
-  })
+      params: {'LAYERS': 'nexrad-n0r-wmst'},
+    }),
+  }),
 ];
 const map = new Map({
   layers: layers,
   target: 'map',
   view: new View({
     center: getCenter(extent),
-    zoom: 4
-  })
+    zoom: 4,
+  }),
 });
 
 function updateInfo() {
@@ -54,14 +54,14 @@ function setTime() {
 }
 setTime();
 
-const stop = function() {
+const stop = function () {
   if (animationId !== null) {
     window.clearInterval(animationId);
     animationId = null;
   }
 };
 
-const play = function() {
+const play = function () {
   stop();
   animationId = window.setInterval(setTime, 1000 / frameRate);
 };