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/MapBrowserEvent.js

@@ -9,7 +9,6 @@ import MapEvent from './MapEvent.js';
  * See {@link module:ol/PluggableMap~PluggableMap} for which events trigger a map browser event.
  */
 class MapBrowserEvent extends MapEvent {
-
   /**
    * @param {string} type Event type.
    * @param {import("./PluggableMap.js").default} map Map.
@@ -18,7 +17,6 @@ class MapBrowserEvent extends MapEvent {
    * @param {?import("./PluggableMap.js").FrameState=} opt_frameState Frame state.
    */
   constructor(type, map, browserEvent, opt_dragging, opt_frameState) {
-
     super(type, map, opt_frameState);
 
     /**
@@ -49,7 +47,6 @@ class MapBrowserEvent extends MapEvent {
      * @api
      */
     this.dragging = opt_dragging !== undefined ? opt_dragging : false;
-
   }
 
   /**
@@ -104,5 +101,4 @@ class MapBrowserEvent extends MapEvent {
   }
 }
 
-
 export default MapBrowserEvent;