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/events/Target.js

@@ -2,16 +2,14 @@
  * @module ol/events/Target
  */
 import Disposable from '../Disposable.js';
-import {VOID} from '../functions.js';
 import Event from './Event.js';
+import {VOID} from '../functions.js';
 import {clear} from '../obj.js';
 
-
 /**
  * @typedef {EventTarget|Target} EventTargetLike
  */
 
-
 /**
  * @classdesc
  * A simplified implementation of the W3C DOM Level 2 EventTarget interface.
@@ -28,12 +26,10 @@ import {clear} from '../obj.js';
  *    returns false.
  */
 class Target extends Disposable {
-
   /**
    * @param {*=} opt_target Default event target for dispatched events.
    */
   constructor(opt_target) {
-
     super();
 
     /**
@@ -59,7 +55,6 @@ class Target extends Disposable {
      * @type {!Object<string, Array<import("../events.js").Listener>>}
      */
     this.listeners_ = {};
-
   }
 
   /**
@@ -107,9 +102,13 @@ class Target extends Disposable {
       ++this.dispatching_[type];
       for (let i = 0, ii = listeners.length; i < ii; ++i) {
         if ('handleEvent' in listeners[i]) {
-          propagate = /** @type {import("../events.js").ListenerObject} */ (listeners[i]).handleEvent(evt);
+          propagate = /** @type {import("../events.js").ListenerObject} */ (listeners[
+            i
+          ]).handleEvent(evt);
         } else {
-          propagate = /** @type {import("../events.js").ListenerFunction} */ (listeners[i]).call(this, evt);
+          propagate = /** @type {import("../events.js").ListenerFunction} */ (listeners[
+            i
+          ]).call(this, evt);
         }
         if (propagate === false || evt.propagationStopped) {
           propagate = false;
@@ -153,9 +152,9 @@ class Target extends Disposable {
    * @return {boolean} Has listeners.
    */
   hasListener(opt_type) {
-    return opt_type ?
-      opt_type in this.listeners_ :
-      Object.keys(this.listeners_).length > 0;
+    return opt_type
+      ? opt_type in this.listeners_
+      : Object.keys(this.listeners_).length > 0;
   }
 
   /**
@@ -182,5 +181,4 @@ class Target extends Disposable {
   }
 }
 
-
 export default Target;