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/reusable-source.js

@@ -1,15 +1,20 @@
 import Map from '../src/ol/Map.js';
-import View from '../src/ol/View.js';
 import TileLayer from '../src/ol/layer/Tile.js';
+import View from '../src/ol/View.js';
 import XYZ from '../src/ol/source/XYZ.js';
 
-const key = 'pk.eyJ1IjoiYWhvY2V2YXIiLCJhIjoiY2pzbmg0Nmk5MGF5NzQzbzRnbDNoeHJrbiJ9.7_-_gL8ur7ZtEiNwRfCy7Q';
+const key =
+  'pk.eyJ1IjoiYWhvY2V2YXIiLCJhIjoiY2pzbmg0Nmk5MGF5NzQzbzRnbDNoeHJrbiJ9.7_-_gL8ur7ZtEiNwRfCy7Q';
 const baseUrl = 'https://{a-c}.tiles.mapbox.com/v4';
 const urls = [
   baseUrl + '/mapbox.blue-marble-topo-jan/{z}/{x}/{y}.png?access_token=' + key,
-  baseUrl + '/mapbox.blue-marble-topo-bathy-jan/{z}/{x}/{y}.png?access_token=' + key,
+  baseUrl +
+    '/mapbox.blue-marble-topo-bathy-jan/{z}/{x}/{y}.png?access_token=' +
+    key,
   baseUrl + '/mapbox.blue-marble-topo-jul/{z}/{x}/{y}.png?access_token=' + key,
-  baseUrl + '/mapbox.blue-marble-topo-bathy-jul/{z}/{x}/{y}.png?access_token=' + key
+  baseUrl +
+    '/mapbox.blue-marble-topo-bathy-jul/{z}/{x}/{y}.png?access_token=' +
+    key,
 ];
 
 const source = new XYZ();
@@ -18,16 +23,15 @@ const map = new Map({
   target: 'map',
   layers: [
     new TileLayer({
-      source: source
-    })
+      source: source,
+    }),
   ],
   view: new View({
     center: [0, 0],
-    zoom: 2
-  })
+    zoom: 2,
+  }),
 });
 
-
 function updateUrl(index) {
   source.setUrl(urls[index]);
 }