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/render/Event.js

@@ -5,7 +5,6 @@
 import Event from '../events/Event.js';
 
 class RenderEvent extends Event {
-
   /**
    * @param {import("./EventType.js").default} type Type.
    * @param {import("../transform.js").Transform=} opt_inversePixelTransform Transform for
@@ -14,7 +13,6 @@ class RenderEvent extends Event {
    * @param {?CanvasRenderingContext2D=} opt_context Context.
    */
   constructor(type, opt_inversePixelTransform, opt_frameState, opt_context) {
-
     super(type);
 
     /**
@@ -39,9 +37,7 @@ class RenderEvent extends Event {
      * @api
      */
     this.context = opt_context;
-
   }
-
 }
 
 export default RenderEvent;