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/Kinetic.js

@@ -9,7 +9,6 @@
  * @api
  */
 class Kinetic {
-
   /**
    * @param {number} decay Rate of decay (must be negative).
    * @param {number} minVelocity Minimum velocity (pixels/millisecond).
@@ -17,7 +16,6 @@ class Kinetic {
    *     initial values (milliseconds).
    */
   constructor(decay, minVelocity, delay) {
-
     /**
      * @private
      * @type {number}