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.

rendering/cases/vector-zindex/main.js

@@ -1,32 +1,40 @@
-import Map from '../../../src/ol/Map.js';
-import View from '../../../src/ol/View.js';
 import Feature from '../../../src/ol/Feature.js';
 import LineString from '../../../src/ol/geom/LineString.js';
+import Map from '../../../src/ol/Map.js';
+import Stroke from '../../../src/ol/style/Stroke.js';
+import Style from '../../../src/ol/style/Style.js';
 import VectorLayer from '../../../src/ol/layer/Vector.js';
 import VectorSource from '../../../src/ol/source/Vector.js';
-import Style from '../../../src/ol/style/Style.js';
-import Stroke from '../../../src/ol/style/Stroke.js';
-
+import View from '../../../src/ol/View.js';
 
 const vectorSourceRed = new VectorSource();
 const vectorSourceBlue = new VectorSource();
 let feature;
 
 feature = new Feature({
-  geometry: new LineString([[-60, 20], [45, 20]])
+  geometry: new LineString([
+    [-60, 20],
+    [45, 20],
+  ]),
 });
-feature.setStyle(new Style({
-  stroke: new Stroke({color: '#f00', width: 10})
-}));
+feature.setStyle(
+  new Style({
+    stroke: new Stroke({color: '#f00', width: 10}),
+  })
+);
 vectorSourceRed.addFeature(feature);
 
-
 feature = new Feature({
-  geometry: new LineString([[0, -50], [0, 60]])
+  geometry: new LineString([
+    [0, -50],
+    [0, 60],
+  ]),
 });
-feature.setStyle(new Style({
-  stroke: new Stroke({color: '#00f', width: 16})
-}));
+feature.setStyle(
+  new Style({
+    stroke: new Stroke({color: '#00f', width: 16}),
+  })
+);
 vectorSourceBlue.addFeature(feature);
 
 new Map({
@@ -34,17 +42,17 @@ new Map({
   layers: [
     new VectorLayer({
       zIndex: 1,
-      source: vectorSourceRed
+      source: vectorSourceRed,
     }),
     new VectorLayer({
-      source: vectorSourceBlue
-    })
+      source: vectorSourceBlue,
+    }),
   ],
   target: 'map',
   view: new View({
     center: [0, 0],
-    resolution: 1
-  })
+    resolution: 1,
+  }),
 });
 
 render();