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/synthetic-lines.js

@@ -1,12 +1,11 @@
 import Feature from '../src/ol/Feature.js';
-import Map from '../src/ol/Map.js';
-import View from '../src/ol/View.js';
 import LineString from '../src/ol/geom/LineString.js';
+import Map from '../src/ol/Map.js';
 import VectorLayer from '../src/ol/layer/Vector.js';
 import VectorSource from '../src/ol/source/Vector.js';
+import View from '../src/ol/View.js';
 import {Stroke, Style} from '../src/ol/style.js';
 
-
 const count = 10000;
 const features = new Array(count);
 
@@ -30,7 +29,7 @@ for (i = 0; i < count; ++i) {
   deltaY = delta * signY;
   endPoint = [startPoint[0] + deltaX, startPoint[1] + deltaY];
   features[i] = new Feature({
-    'geometry': new LineString([startPoint, endPoint])
+    'geometry': new LineString([startPoint, endPoint]),
   });
   startPoint = endPoint;
 }
@@ -38,23 +37,23 @@ for (i = 0; i < count; ++i) {
 const vector = new VectorLayer({
   source: new VectorSource({
     features: features,
-    wrapX: false
+    wrapX: false,
   }),
   style: new Style({
     stroke: new Stroke({
       color: '#666666',
-      width: 1
-    })
-  })
+      width: 1,
+    }),
+  }),
 });
 
 const view = new View({
   center: [0, 0],
-  zoom: 0
+  zoom: 0,
 });
 
 const map = new Map({
   layers: [vector],
   target: 'map',
-  view: view
+  view: view,
 });