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/wms-tiled.js

@@ -1,13 +1,12 @@
 import Map from '../src/ol/Map.js';
-import View from '../src/ol/View.js';
-import TileLayer from '../src/ol/layer/Tile.js';
 import OSM from '../src/ol/source/OSM.js';
+import TileLayer from '../src/ol/layer/Tile.js';
 import TileWMS from '../src/ol/source/TileWMS.js';
-
+import View from '../src/ol/View.js';
 
 const layers = [
   new TileLayer({
-    source: new OSM()
+    source: new OSM(),
   }),
   new TileLayer({
     extent: [-13884991, 2870341, -7455066, 6338219],
@@ -16,15 +15,15 @@ const layers = [
       params: {'LAYERS': 'topp:states', 'TILED': true},
       serverType: 'geoserver',
       // Countries have transparency, so do not fade tiles:
-      transition: 0
-    })
-  })
+      transition: 0,
+    }),
+  }),
 ];
 const map = new Map({
   layers: layers,
   target: 'map',
   view: new View({
     center: [-10997148, 4569099],
-    zoom: 4
-  })
+    zoom: 4,
+  }),
 });