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/polygon-style-gradient-pattern/main.js

@@ -1,13 +1,12 @@
-import Map from '../../../src/ol/Map.js';
-import View from '../../../src/ol/View.js';
 import Feature from '../../../src/ol/Feature.js';
+import Fill from '../../../src/ol/style/Fill.js';
+import Map from '../../../src/ol/Map.js';
 import Polygon from '../../../src/ol/geom/Polygon.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 Fill from '../../../src/ol/style/Fill.js';
-import Stroke from '../../../src/ol/style/Stroke.js';
-
+import View from '../../../src/ol/View.js';
 
 // create gradient
 const canvas = document.createElement('canvas');
@@ -34,51 +33,84 @@ context.arc(5, 5, 2, 0, 2 * Math.PI);
 context.fill();
 const pattern = context.createPattern(canvas, 'repeat');
 
-
 const vectorSource = new VectorSource();
 let feature;
 
 // rectangle with 1 hole
 feature = new Feature({
   geometry: new Polygon([
-    [[-22.5, -5], [-22.5, 35], [37.5, 35], [37.5, -5], [-22.5, -5]],
-    [[-2.5, 7], [17.5, 7], [17.5, 23], [-2.5, 23], [-2.5, 7]]
-  ])
+    [
+      [-22.5, -5],
+      [-22.5, 35],
+      [37.5, 35],
+      [37.5, -5],
+      [-22.5, -5],
+    ],
+    [
+      [-2.5, 7],
+      [17.5, 7],
+      [17.5, 23],
+      [-2.5, 23],
+      [-2.5, 7],
+    ],
+  ]),
 });
 
-feature.setStyle(new Style({
-  fill: new Fill({color: pattern}),
-  stroke: new Stroke({color: gradient, width: 3})
-}));
+feature.setStyle(
+  new Style({
+    fill: new Fill({color: pattern}),
+    stroke: new Stroke({color: gradient, width: 3}),
+  })
+);
 vectorSource.addFeature(feature);
 
 // rectangle with 2 holes
 feature = new Feature({
   geometry: new Polygon([
-    [[-37.5, -32.5], [-37.5, 17.5], [32.5, 17.5], [32.5, -32.5], [-37.5, -32.5]],
-    [[-33.5, -28.5], [-21.5, -28.5], [-21.5, -16.5], [-33.5, -16.5], [-33.5, -28.5]],
-    [[12.5, -28.5], [26.5, -28.5], [26.5, -16.5], [12.5, -16.5], [12.5, -28.5]]
-  ])
+    [
+      [-37.5, -32.5],
+      [-37.5, 17.5],
+      [32.5, 17.5],
+      [32.5, -32.5],
+      [-37.5, -32.5],
+    ],
+    [
+      [-33.5, -28.5],
+      [-21.5, -28.5],
+      [-21.5, -16.5],
+      [-33.5, -16.5],
+      [-33.5, -28.5],
+    ],
+    [
+      [12.5, -28.5],
+      [26.5, -28.5],
+      [26.5, -16.5],
+      [12.5, -16.5],
+      [12.5, -28.5],
+    ],
+  ]),
 });
 
-feature.setStyle(new Style({
-  fill: new Fill({color: gradient}),
-  stroke: new Stroke({color: pattern, width: 5})
-}));
+feature.setStyle(
+  new Style({
+    fill: new Fill({color: gradient}),
+    stroke: new Stroke({color: pattern, width: 5}),
+  })
+);
 vectorSource.addFeature(feature);
 
 new Map({
   pixelRatio: 1,
   layers: [
     new VectorLayer({
-      source: vectorSource
-    })
+      source: vectorSource,
+    }),
   ],
   target: 'map',
   view: new View({
     center: [0, 0],
-    resolution: 1
-  })
+    resolution: 1,
+  }),
 });
 
 render();