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/epsg-4326.js

@@ -1,9 +1,8 @@
 import Map from '../src/ol/Map.js';
-import View from '../src/ol/View.js';
-import {defaults as defaultControls, ScaleLine} from '../src/ol/control.js';
 import TileLayer from '../src/ol/layer/Tile.js';
 import TileWMS from '../src/ol/source/TileWMS.js';
-
+import View from '../src/ol/View.js';
+import {ScaleLine, defaults as defaultControls} from '../src/ol/control.js';
 
 const layers = [
   new TileLayer({
@@ -11,23 +10,23 @@ const layers = [
       url: 'https://ahocevar.com/geoserver/wms',
       params: {
         'LAYERS': 'ne:NE1_HR_LC_SR_W_DR',
-        'TILED': true
-      }
-    })
-  })
+        'TILED': true,
+      },
+    }),
+  }),
 ];
 
 const map = new Map({
   controls: defaultControls().extend([
     new ScaleLine({
-      units: 'degrees'
-    })
+      units: 'degrees',
+    }),
   ]),
   layers: layers,
   target: 'map',
   view: new View({
     projection: 'EPSG:4326',
     center: [0, 0],
-    zoom: 2
-  })
+    zoom: 2,
+  }),
 });