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/graticule.js

@@ -1,33 +1,32 @@
 import Graticule from '../src/ol/layer/Graticule.js';
 import Map from '../src/ol/Map.js';
-import View from '../src/ol/View.js';
-import TileLayer from '../src/ol/layer/Tile.js';
-import {fromLonLat} from '../src/ol/proj.js';
 import OSM from '../src/ol/source/OSM.js';
 import Stroke from '../src/ol/style/Stroke.js';
-
+import TileLayer from '../src/ol/layer/Tile.js';
+import View from '../src/ol/View.js';
+import {fromLonLat} from '../src/ol/proj.js';
 
 const map = new Map({
   layers: [
     new TileLayer({
       source: new OSM({
-        wrapX: false
-      })
+        wrapX: false,
+      }),
     }),
     new Graticule({
       // the style to use for the lines, optional.
       strokeStyle: new Stroke({
         color: 'rgba(255,120,0,0.9)',
         width: 2,
-        lineDash: [0.5, 4]
+        lineDash: [0.5, 4],
       }),
       showLabels: true,
-      wrapX: false
-    })
+      wrapX: false,
+    }),
   ],
   target: 'map',
   view: new View({
     center: fromLonLat([4.8, 47.75]),
-    zoom: 5
-  })
+    zoom: 5,
+  }),
 });