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.

src/ol/source/CartoDB.js

@@ -2,9 +2,9 @@
  * @module ol/source/CartoDB
  */
 
-import {assign} from '../obj.js';
 import SourceState from './State.js';
 import XYZ from './XYZ.js';
+import {assign} from '../obj.js';
 
 /**
  * @typedef {Object} Options
@@ -29,7 +29,6 @@ import XYZ from './XYZ.js';
  * @property {string} account If using named maps, this will be the name of the template to load.
  */
 
-
 /**
  * @typedef {Object} CartoDBLayerInfo
  * @property {string} layergroupid The layer group ID
@@ -53,7 +52,7 @@ class CartoDB extends XYZ {
       maxZoom: options.maxZoom !== undefined ? options.maxZoom : 18,
       minZoom: options.minZoom,
       projection: options.projection,
-      wrapX: options.wrapX
+      wrapX: options.wrapX,
     });
 
     /**
@@ -132,7 +131,10 @@ class CartoDB extends XYZ {
     }
 
     const client = new XMLHttpRequest();
-    client.addEventListener('load', this.handleInitResponse_.bind(this, paramHash));
+    client.addEventListener(
+      'load',
+      this.handleInitResponse_.bind(this, paramHash)
+    );
     client.addEventListener('error', this.handleInitError_.bind(this));
     client.open('POST', mapUrl);
     client.setRequestHeader('Content-type', 'application/json');
@@ -149,10 +151,12 @@ class CartoDB extends XYZ {
   handleInitResponse_(paramHash, event) {
     const client = /** @type {XMLHttpRequest} */ (event.target);
     // status will be 0 for file:// urls
-    if (!client.status || client.status >= 200 && client.status < 300) {
+    if (!client.status || (client.status >= 200 && client.status < 300)) {
       let response;
       try {
-        response = /** @type {CartoDBLayerInfo} */(JSON.parse(client.responseText));
+        response = /** @type {CartoDBLayerInfo} */ (JSON.parse(
+          client.responseText
+        ));
       } catch (err) {
         this.setState(SourceState.ERROR);
         return;
@@ -179,11 +183,16 @@ class CartoDB extends XYZ {
    * @private
    */
   applyTemplate_(data) {
-    const tilesUrl = 'https://' + data.cdn_url.https + '/' + this.account_ +
-        '/api/v1/map/' + data.layergroupid + '/{z}/{x}/{y}.png';
+    const tilesUrl =
+      'https://' +
+      data.cdn_url.https +
+      '/' +
+      this.account_ +
+      '/api/v1/map/' +
+      data.layergroupid +
+      '/{z}/{x}/{y}.png';
     this.setUrl(tilesUrl);
   }
 }
 
-
 export default CartoDB;