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/Map.js

@@ -1,11 +1,11 @@
 /**
  * @module ol/Map
  */
+import CompositeMapRenderer from './renderer/Composite.js';
 import PluggableMap from './PluggableMap.js';
+import {assign} from './obj.js';
 import {defaults as defaultControls} from './control.js';
 import {defaults as defaultInteractions} from './interaction.js';
-import {assign} from './obj.js';
-import CompositeMapRenderer from './renderer/Composite.js';
 
 /**
  * @classdesc
@@ -55,7 +55,6 @@ import CompositeMapRenderer from './renderer/Composite.js';
  * @api
  */
 class Map extends PluggableMap {
-
   /**
    * @param {import("./PluggableMap.js").MapOptions} options Map options.
    */
@@ -76,5 +75,4 @@ class Map extends PluggableMap {
   }
 }
 
-
 export default Map;