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/wmts-layer-from-capabilities.js

@@ -1,37 +1,39 @@
 import Map from '../src/ol/Map.js';
-import View from '../src/ol/View.js';
-import WMTSCapabilities from '../src/ol/format/WMTSCapabilities.js';
-import TileLayer from '../src/ol/layer/Tile.js';
 import OSM from '../src/ol/source/OSM.js';
+import TileLayer from '../src/ol/layer/Tile.js';
+import View from '../src/ol/View.js';
 import WMTS, {optionsFromCapabilities} from '../src/ol/source/WMTS.js';
+import WMTSCapabilities from '../src/ol/format/WMTSCapabilities.js';
 
 const parser = new WMTSCapabilities();
 let map;
 
-fetch('data/WMTSCapabilities.xml').then(function(response) {
-  return response.text();
-}).then(function(text) {
-  const result = parser.read(text);
-  const options = optionsFromCapabilities(result, {
-    layer: 'layer-7328',
-    matrixSet: 'EPSG:3857'
-  });
+fetch('data/WMTSCapabilities.xml')
+  .then(function (response) {
+    return response.text();
+  })
+  .then(function (text) {
+    const result = parser.read(text);
+    const options = optionsFromCapabilities(result, {
+      layer: 'layer-7328',
+      matrixSet: 'EPSG:3857',
+    });
 
-  map = new Map({
-    layers: [
-      new TileLayer({
-        source: new OSM(),
-        opacity: 0.7
+    map = new Map({
+      layers: [
+        new TileLayer({
+          source: new OSM(),
+          opacity: 0.7,
+        }),
+        new TileLayer({
+          opacity: 1,
+          source: new WMTS(options),
+        }),
+      ],
+      target: 'map',
+      view: new View({
+        center: [19412406.33, -5050500.21],
+        zoom: 5,
       }),
-      new TileLayer({
-        opacity: 1,
-        source: new WMTS(options)
-      })
-    ],
-    target: 'map',
-    view: new View({
-      center: [19412406.33, -5050500.21],
-      zoom: 5
-    })
+    });
   });
-});