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/webgl-points/main.js

@@ -1,32 +1,32 @@
-import Map from '../../../src/ol/Map.js';
-import View from '../../../src/ol/View.js';
-import TileLayer from '../../../src/ol/layer/Tile.js';
-import XYZ from '../../../src/ol/source/XYZ.js';
-import VectorSource from '../../../src/ol/source/Vector.js';
 import KML from '../../../src/ol/format/KML.js';
+import Map from '../../../src/ol/Map.js';
+import TileLayer from '../../../src/ol/layer/Tile.js';
+import VectorSource from '../../../src/ol/source/Vector.js';
+import View from '../../../src/ol/View.js';
 import WebGLPointsLayer from '../../../src/ol/layer/WebGLPoints.js';
+import XYZ from '../../../src/ol/source/XYZ.js';
 
 const vector = new WebGLPointsLayer({
   source: new VectorSource({
     url: '/data/2012_Earthquakes_Mag5.kml',
     format: new KML({
-      extractStyles: false
-    })
+      extractStyles: false,
+    }),
   }),
   style: {
     symbol: {
       symbolType: 'square',
       size: 4,
-      color: 'white'
-    }
-  }
+      color: 'white',
+    },
+  },
 });
 
 const raster = new TileLayer({
   source: new XYZ({
     url: '/data/tiles/satellite/{z}/{x}/{y}.jpg',
-    transition: 0
-  })
+    transition: 0,
+  }),
 });
 
 new Map({
@@ -34,10 +34,10 @@ new Map({
   target: 'map',
   view: new View({
     center: [15180597.9736, 2700366.3807],
-    zoom: 2
-  })
+    zoom: 2,
+  }),
 });
 
 render({
-  message: 'Points are rendered using webgl as 4px pixel squares'
+  message: 'Points are rendered using webgl as 4px pixel squares',
 });