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/reproj-image/main.js

@@ -1,31 +1,30 @@
-import Map from '../../../src/ol/Map.js';
-import View from '../../../src/ol/View.js';
-import Static from '../../../src/ol/source/ImageStatic.js';
-import {
-  get as getProjection,
-  transformExtent
-} from '../../../src/ol/proj.js';
 import ImageLayer from '../../../src/ol/layer/Image.js';
+import Map from '../../../src/ol/Map.js';
+import Static from '../../../src/ol/source/ImageStatic.js';
+import View from '../../../src/ol/View.js';
+import {get as getProjection, transformExtent} from '../../../src/ol/proj.js';
 
 const 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')
+  projection: getProjection('EPSG:3857'),
 });
 
 new Map({
   pixelRatio: 1,
   target: 'map',
-  layers: [new ImageLayer({
-    source: source
-  })],
+  layers: [
+    new ImageLayer({
+      source: source,
+    }),
+  ],
   view: new View({
     center: [-122.416667, 37.783333],
     zoom: 8,
-    projection: 'EPSG:4326'
-  })
+    projection: 'EPSG:4326',
+  }),
 });
 
 render({
-  tolerance: 0.001
+  tolerance: 0.001,
 });