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/tissot.js

@@ -1,17 +1,17 @@
 import Feature from '../src/ol/Feature.js';
 import Map from '../src/ol/Map.js';
-import View from '../src/ol/View.js';
-import {circular as circularPolygon} from '../src/ol/geom/Polygon.js';
-import {Tile as TileLayer, Vector as VectorLayer} from '../src/ol/layer.js';
 import TileWMS from '../src/ol/source/TileWMS.js';
 import VectorSource from '../src/ol/source/Vector.js';
+import View from '../src/ol/View.js';
+import {Tile as TileLayer, Vector as VectorLayer} from '../src/ol/layer.js';
+import {circular as circularPolygon} from '../src/ol/geom/Polygon.js';
 
 const vectorLayer4326 = new VectorLayer({
-  source: new VectorSource()
+  source: new VectorSource(),
 });
 
 const vectorLayer3857 = new VectorLayer({
-  source: new VectorSource()
+  source: new VectorSource(),
 });
 
 const map4326 = new Map({
@@ -21,18 +21,18 @@ const map4326 = new Map({
         url: 'https://ahocevar.com/geoserver/wms',
         params: {
           'LAYERS': 'ne:NE1_HR_LC_SR_W_DR',
-          'TILED': true
-        }
-      })
+          'TILED': true,
+        },
+      }),
     }),
-    vectorLayer4326
+    vectorLayer4326,
   ],
   target: 'map4326',
   view: new View({
     projection: 'EPSG:4326',
     center: [0, 0],
-    zoom: 2
-  })
+    zoom: 2,
+  }),
 });
 
 const map3857 = new Map({
@@ -42,17 +42,17 @@ const map3857 = new Map({
         url: 'https://ahocevar.com/geoserver/wms',
         params: {
           'LAYERS': 'ne:NE1_HR_LC_SR_W_DR',
-          'TILED': true
-        }
-      })
+          'TILED': true,
+        },
+      }),
     }),
-    vectorLayer3857
+    vectorLayer3857,
   ],
   target: 'map3857',
   view: new View({
     center: [0, 0],
-    zoom: 2
-  })
+    zoom: 2,
+  }),
 });
 
 const radius = 800000;