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/bing-maps.js

@@ -1,38 +1,40 @@
-import Map from '../src/ol/Map.js';
-import View from '../src/ol/View.js';
-import TileLayer from '../src/ol/layer/Tile.js';
 import BingMaps from '../src/ol/source/BingMaps.js';
-
+import Map from '../src/ol/Map.js';
+import TileLayer from '../src/ol/layer/Tile.js';
+import View from '../src/ol/View.js';
 
 const styles = [
   'RoadOnDemand',
   'Aerial',
   'AerialWithLabelsOnDemand',
   'CanvasDark',
-  'OrdnanceSurvey'
+  'OrdnanceSurvey',
 ];
 const layers = [];
 let i, ii;
 for (i = 0, ii = styles.length; i < ii; ++i) {
-  layers.push(new TileLayer({
-    visible: false,
-    preload: Infinity,
-    source: new BingMaps({
-      key: 'ApTJzdkyN1DdFKkRAE6QIDtzihNaf6IWJsT-nQ_2eMoO4PN__0Tzhl2-WgJtXFSp ',
-      imagerySet: styles[i]
-      // use maxZoom 19 to see stretched tiles instead of the BingMaps
-      // "no photos at this zoom level" tiles
-      // maxZoom: 19
+  layers.push(
+    new TileLayer({
+      visible: false,
+      preload: Infinity,
+      source: new BingMaps({
+        key:
+          'ApTJzdkyN1DdFKkRAE6QIDtzihNaf6IWJsT-nQ_2eMoO4PN__0Tzhl2-WgJtXFSp ',
+        imagerySet: styles[i],
+        // use maxZoom 19 to see stretched tiles instead of the BingMaps
+        // "no photos at this zoom level" tiles
+        // maxZoom: 19
+      }),
     })
-  }));
+  );
 }
 const map = new Map({
   layers: layers,
   target: 'map',
   view: new View({
     center: [-6655.5402445057125, 6709968.258934638],
-    zoom: 13
-  })
+    zoom: 13,
+  }),
 });
 
 const select = document.getElementById('layer-select');