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/xyz-esri-4326-512.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';
 
 const map = new Map({
@@ -9,20 +9,21 @@ const map = new Map({
     new TileLayer({
       source: new XYZ({
         attributions: 'Copyright:© 2013 ESRI, i-cubed, GeoEye',
-        url: 'https://services.arcgisonline.com/arcgis/rest/services/' +
-            'ESRI_Imagery_World_2D/MapServer/tile/{z}/{y}/{x}',
+        url:
+          'https://services.arcgisonline.com/arcgis/rest/services/' +
+          'ESRI_Imagery_World_2D/MapServer/tile/{z}/{y}/{x}',
         maxZoom: 15,
         projection: 'EPSG:4326',
         tileSize: 512, // the tile size supported by the ArcGIS tile service
         maxResolution: 180 / 512, // Esri's tile grid fits 180 degrees on one 512 px tile
-        wrapX: true
-      })
-    })
+        wrapX: true,
+      }),
+    }),
   ],
   view: new View({
     center: [0, 0],
     projection: 'EPSG:4326',
     zoom: 2,
-    minZoom: 2
-  })
+    minZoom: 2,
+  }),
 });