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/render/Box.js

@@ -43,7 +43,6 @@ class RenderBox extends Disposable {
      * @type {import("../pixel.js").Pixel}
      */
     this.endPixel_ = null;
-
   }
 
   /**
@@ -106,9 +105,12 @@ class RenderBox extends Disposable {
       startPixel,
       [startPixel[0], endPixel[1]],
       endPixel,
-      [endPixel[0], startPixel[1]]
+      [endPixel[0], startPixel[1]],
     ];
-    const coordinates = pixels.map(this.map_.getCoordinateFromPixelInternal, this.map_);
+    const coordinates = pixels.map(
+      this.map_.getCoordinateFromPixelInternal,
+      this.map_
+    );
     // close the polygon
     coordinates[4] = coordinates[0].slice();
     if (!this.geometry_) {
@@ -126,5 +128,4 @@ class RenderBox extends Disposable {
   }
 }
 
-
 export default RenderBox;