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/VectorTile.js

@@ -5,7 +5,6 @@ import Tile from './Tile.js';
 import TileState from './TileState.js';
 
 class VectorTile extends Tile {
-
   /**
    * @param {import("./tilecoord.js").TileCoord} tileCoord Tile coordinate.
    * @param {TileState} state State.
@@ -15,7 +14,6 @@ class VectorTile extends Tile {
    * @param {import("./Tile.js").Options=} opt_options Tile options.
    */
   constructor(tileCoord, state, src, format, tileLoadFunction, opt_options) {
-
     super(tileCoord, state, opt_options);
 
     /**
@@ -65,7 +63,6 @@ class VectorTile extends Tile {
      * @type {string}
      */
     this.url_ = src;
-
   }
 
   /**