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/map/main.js

@@ -1,9 +1,9 @@
 import Feature from '../../../src/ol/Feature.js';
-import Point from '../../../src/ol/geom/Point.js';
 import Map from '../../../src/ol/Map.js';
-import View from '../../../src/ol/View.js';
+import Point from '../../../src/ol/geom/Point.js';
 import VectorLayer from '../../../src/ol/layer/Vector.js';
 import VectorSource from '../../../src/ol/source/Vector.js';
+import View from '../../../src/ol/View.js';
 
 new Map({
   pixelRatio: 1,
@@ -11,17 +11,19 @@ new Map({
   layers: [
     new VectorLayer({
       source: new VectorSource({
-        features: [new Feature({
-          geometry: new Point([0, 0])
-        })]
-      })
-    })
+        features: [
+          new Feature({
+            geometry: new Point([0, 0]),
+          }),
+        ],
+      }),
+    }),
   ],
   view: new View({
     projection: 'EPSG:4326',
     center: [0, 0],
-    resolution: 1
-  })
+    resolution: 1,
+  }),
 });
 
 render();