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/zoom-constrained.js

@@ -1,11 +1,11 @@
 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 key = 'get_your_own_D6rA4zTHduk6KOKTXzGB';
-const attributions = '<a href="https://www.maptiler.com/copyright/" target="_blank">&copy; MapTiler</a> ' +
+const attributions =
+  '<a href="https://www.maptiler.com/copyright/" target="_blank">&copy; MapTiler</a> ' +
   '<a href="https://www.openstreetmap.org/copyright" target="_blank">&copy; OpenStreetMap contributors</a>';
 
 const map = new Map({
@@ -14,14 +14,15 @@ const map = new Map({
     new TileLayer({
       source: new XYZ({
         attributions: attributions,
-        url: 'https://api.maptiler.com/tiles/satellite/{z}/{x}/{y}.jpg?key=' + key
-      })
-    })
+        url:
+          'https://api.maptiler.com/tiles/satellite/{z}/{x}/{y}.jpg?key=' + key,
+      }),
+    }),
   ],
   view: new View({
     center: [-13553864, 5918250],
     zoom: 11,
     minZoom: 9,
-    maxZoom: 13
-  })
+    maxZoom: 13,
+  }),
 });