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/control.js

@@ -1,8 +1,8 @@
 /**
  * @module ol/control
  */
-import Collection from './Collection.js';
 import Attribution from './control/Attribution.js';
+import Collection from './Collection.js';
 import Rotate from './control/Rotate.js';
 import Zoom from './control/Zoom.js';
 
@@ -33,7 +33,6 @@ export {default as ZoomToExtent} from './control/ZoomToExtent.js';
  * @api
  */
 
-
 /**
  * Set of controls included in maps by default. Unless configured otherwise,
  * this returns a collection containing an instance of each of the following
@@ -49,7 +48,6 @@ export {default as ZoomToExtent} from './control/ZoomToExtent.js';
  * @api
  */
 export function defaults(opt_options) {
-
   const options = opt_options ? opt_options : {};
 
   const controls = new Collection();
@@ -64,8 +62,8 @@ export function defaults(opt_options) {
     controls.push(new Rotate(options.rotateOptions));
   }
 
-  const attributionControl = options.attribution !== undefined ?
-    options.attribution : true;
+  const attributionControl =
+    options.attribution !== undefined ? options.attribution : true;
   if (attributionControl) {
     controls.push(new Attribution(options.attributionOptions));
   }