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/reproj-tile-dateline-merc/main.js

@@ -1,16 +1,16 @@
 import Map from '../../../src/ol/Map.js';
+import TileLayer from '../../../src/ol/layer/Tile.js';
 import View from '../../../src/ol/View.js';
 import XYZ from '../../../src/ol/source/XYZ.js';
-import TileLayer from '../../../src/ol/layer/Tile.js';
+import proj4 from 'proj4';
 import {get, transform} from '../../../src/ol/proj.js';
 import {register} from '../../../src/ol/proj/proj4.js';
-import proj4 from 'proj4';
 
 proj4.defs('merc_180', '+proj=merc +lon_0=180 +units=m +no_defs');
 
 register(proj4);
 const merc = get('merc_180');
-merc.setExtent([-20026376.39, -20048966.10, 20026376.39, 20048966.10]);
+merc.setExtent([-20026376.39, -20048966.1, 20026376.39, 20048966.1]);
 
 const center4326 = [180, 0];
 const center = transform(center4326, 'EPSG:4326', 'merc_180');
@@ -19,7 +19,7 @@ const source = new XYZ({
   projection: 'EPSG:4326',
   minZoom: 0,
   maxZoom: 0,
-  url: '/data/tiles/4326/{z}/{x}/{y}.png'
+  url: '/data/tiles/4326/{z}/{x}/{y}.png',
 });
 
 new Map({
@@ -27,14 +27,14 @@ new Map({
   target: 'map',
   layers: [
     new TileLayer({
-      source: source
-    })
+      source: source,
+    }),
   ],
   view: new View({
     projection: 'merc_180',
     center: center,
-    zoom: 0
-  })
+    zoom: 0,
+  }),
 });
 
 render();