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/side-by-side.js

@@ -1,10 +1,11 @@
 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 = 'get_your_own_D6rA4zTHduk6KOKTXzGB';
-const attributions = '<a href="https://www.maptiler.com/copyright/" target="_blank">&copy; MapTiler</a> ' +
+const attributions =
+  '<a href="https://www.maptiler.com/copyright/" target="_blank">&copy; MapTiler</a> ' +
   '<a href="https://www.openstreetmap.org/copyright" target="_blank">&copy; OpenStreetMap contributors</a>';
 
 const roadLayer = new TileLayer({
@@ -12,31 +13,31 @@ const roadLayer = new TileLayer({
     attributions: attributions,
     url: 'https://api.maptiler.com/maps/streets/{z}/{x}/{y}.png?key=' + key,
     tileSize: 512,
-    maxZoom: 22
-  })
+    maxZoom: 22,
+  }),
 });
 
 const aerialLayer = new TileLayer({
   source: new XYZ({
     attributions: attributions,
     url: 'https://api.maptiler.com/tiles/satellite/{z}/{x}/{y}.jpg?key=' + key,
-    maxZoom: 20
-  })
+    maxZoom: 20,
+  }),
 });
 
 const view = new View({
   center: [-6655.5402445057125, 6709968.258934638],
-  zoom: 13
+  zoom: 13,
 });
 
 const map1 = new Map({
   target: 'roadMap',
   layers: [roadLayer],
-  view: view
+  view: view,
 });
 
 const map2 = new Map({
   target: 'aerialMap',
   layers: [aerialLayer],
-  view: view
+  view: view,
 });