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-northpole/main.js

@@ -1,13 +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('EPSG:3413', '+proj=stere +lat_0=90 +lat_ts=70 +lon_0=-45 ' +
-          '+k=1 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs');
+proj4.defs(
+  'EPSG:3413',
+  '+proj=stere +lat_0=90 +lat_ts=70 +lon_0=-45 ' +
+    '+k=1 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs'
+);
 
 register(proj4);
 const proj3413 = get('EPSG:3413');
@@ -19,7 +22,7 @@ const center = transform(center4326, 'EPSG:4326', 'EPSG:3413');
 const source = new XYZ({
   maxZoom: 0,
   projection: 'EPSG:4326',
-  url: '/data/tiles/4326/{z}/{x}/{y}.png'
+  url: '/data/tiles/4326/{z}/{x}/{y}.png',
 });
 
 new Map({
@@ -27,14 +30,14 @@ new Map({
   target: 'map',
   layers: [
     new TileLayer({
-      source: source
-    })
+      source: source,
+    }),
   ],
   view: new View({
     projection: 'EPSG:3413',
     center: center,
-    zoom: 0
-  })
+    zoom: 0,
+  }),
 });
 
 render();