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/modify-features.js

@@ -1,29 +1,32 @@
+import GeoJSON from '../src/ol/format/GeoJSON.js';
 import Map from '../src/ol/Map.js';
 import View from '../src/ol/View.js';
-import GeoJSON from '../src/ol/format/GeoJSON.js';
-import {defaults as defaultInteractions, Modify, Select} from '../src/ol/interaction.js';
-import {Tile as TileLayer, Vector as VectorLayer} from '../src/ol/layer.js';
+import {
+  Modify,
+  Select,
+  defaults as defaultInteractions,
+} from '../src/ol/interaction.js';
 import {OSM, Vector as VectorSource} from '../src/ol/source.js';
-
+import {Tile as TileLayer, Vector as VectorLayer} from '../src/ol/layer.js';
 
 const raster = new TileLayer({
-  source: new OSM()
+  source: new OSM(),
 });
 
 const vector = new VectorLayer({
   source: new VectorSource({
     url: 'data/geojson/countries.geojson',
     format: new GeoJSON(),
-    wrapX: false
-  })
+    wrapX: false,
+  }),
 });
 
 const select = new Select({
-  wrapX: false
+  wrapX: false,
 });
 
 const modify = new Modify({
-  features: select.getFeatures()
+  features: select.getFeatures(),
 });
 
 const map = new Map({
@@ -32,6 +35,6 @@ const map = new Map({
   target: 'map',
   view: new View({
     center: [0, 0],
-    zoom: 2
-  })
+    zoom: 2,
+  }),
 });