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/colorlike.js

@@ -3,7 +3,6 @@
  */
 import {toString} from './color.js';
 
-
 /**
  * A type accepted by CanvasRenderingContext2D.fillStyle
  * or CanvasRenderingContext2D.strokeStyle.
@@ -16,7 +15,6 @@ import {toString} from './color.js';
  * @api
  */
 
-
 /**
  * @param {import("./color.js").Color|ColorLike} color Color.
  * @return {ColorLike} The color as an {@link ol/colorlike~ColorLike}.