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-tile-disable-smoothing/main.js

@@ -1,9 +1,9 @@
 import Map from '../../../src/ol/Map.js';
+import TileLayer from '../../../src/ol/layer/Tile.js';
 import View from '../../../src/ol/View.js';
 import XYZ from '../../../src/ol/source/XYZ.js';
-import TileLayer from '../../../src/ol/layer/Tile.js';
-import {toLonLat} from '../../../src/ol/proj.js';
 import {createXYZ} from '../../../src/ol/tilegrid.js';
+import {toLonLat} from '../../../src/ol/proj.js';
 
 const tileGrid = createXYZ();
 const extent = tileGrid.getTileCoordExtent([5, 5, 12]);
@@ -14,11 +14,11 @@ const source = new XYZ({
   minZoom: 5,
   maxZoom: 5,
   imageSmoothing: false,
-  url: '/data/tiles/osm/{z}/{x}/{y}.png'
+  url: '/data/tiles/osm/{z}/{x}/{y}.png',
 });
 
 const layer = new TileLayer({
-  source: source
+  source: source,
 });
 
 new Map({
@@ -28,8 +28,8 @@ new Map({
   view: new View({
     projection: 'EPSG:4326',
     center: toLonLat(center),
-    zoom: 10
-  })
+    zoom: 10,
+  }),
 });
 
 render();