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.

rendering/cases/layer-image-extent-rotation-geographic/main.js

@@ -1,12 +1,12 @@
+import ImageLayer from '../../../src/ol/layer/Image.js';
 import Map from '../../../src/ol/Map.js';
-import View from '../../../src/ol/View.js';
 import Static from '../../../src/ol/source/ImageStatic.js';
+import View from '../../../src/ol/View.js';
 import {
   get as getProjection,
   transformExtent,
-  useGeographic
+  useGeographic,
 } from '../../../src/ol/proj.js';
-import ImageLayer from '../../../src/ol/layer/Image.js';
 
 useGeographic();
 
@@ -16,19 +16,25 @@ const extent = [-123.1, 37.1, -122.1, 37.9];
 new Map({
   pixelRatio: 1,
   target: 'map',
-  layers: [new ImageLayer({
-    source: new Static({
-      url: '/data/tiles/osm/5/5/12.png',
-      imageExtent: transformExtent([-123, 37, -122, 38], 'EPSG:4326', 'EPSG:3857'),
-      projection: getProjection('EPSG:3857')
+  layers: [
+    new ImageLayer({
+      source: new Static({
+        url: '/data/tiles/osm/5/5/12.png',
+        imageExtent: transformExtent(
+          [-123, 37, -122, 38],
+          'EPSG:4326',
+          'EPSG:3857'
+        ),
+        projection: getProjection('EPSG:3857'),
+      }),
+      extent,
     }),
-    extent
-  })],
+  ],
   view: new View({
     center,
     zoom: 8,
-    rotation: Math.PI / 4
-  })
+    rotation: Math.PI / 4,
+  }),
 });
 
 render();