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-tile-none-square/main.js

@@ -1,6 +1,6 @@
 import Map from '../../../src/ol/Map.js';
-import View from '../../../src/ol/View.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 {createXYZ} from '../../../src/ol/tilegrid.js';
 
@@ -10,10 +10,10 @@ const layer = new TileLayer({
   source: new XYZ({
     url: '/data/tiles/512x256/{z}/{x}/{y}.png',
     tileGrid: createXYZ({
-      tileSize: [512, 256]
+      tileSize: [512, 256],
     }),
-    transition: 0
-  })
+    transition: 0,
+  }),
 });
 
 const map = new Map({
@@ -21,8 +21,8 @@ const map = new Map({
   pixelRatio: 1,
   view: new View({
     center: center,
-    zoom: 5
-  })
+    zoom: 5,
+  }),
 });
 
 map.addLayer(layer);