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/interaction/DragRotateAndZoom.js

@@ -1,9 +1,8 @@
 /**
  * @module ol/interaction/DragRotateAndZoom
  */
-import {shiftKeyOnly, mouseOnly} from '../events/condition.js';
 import PointerInteraction from './Pointer.js';
-
+import {mouseOnly, shiftKeyOnly} from '../events/condition.js';
 
 /**
  * @typedef {Object} Options
@@ -14,7 +13,6 @@ import PointerInteraction from './Pointer.js';
  * @property {number} [duration=400] Animation duration in milliseconds.
  */
 
-
 /**
  * @classdesc
  * Allows the user to zoom and rotate the map by clicking and dragging
@@ -27,12 +25,10 @@ import PointerInteraction from './Pointer.js';
  * @api
  */
 class DragRotateAndZoom extends PointerInteraction {
-
   /**
    * @param {Options=} opt_options Options.
    */
   constructor(opt_options) {
-
     const options = opt_options ? opt_options : {};
 
     super(/** @type {import("./Pointer.js").Options} */ (options));
@@ -66,7 +62,6 @@ class DragRotateAndZoom extends PointerInteraction {
      * @type {number}
      */
     this.duration_ = options.duration !== undefined ? options.duration : 400;
-
   }
 
   /**