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/interaction/DragZoom.js

@@ -1,11 +1,16 @@
 /**
  * @module ol/interaction/DragZoom
  */
+import DragBox from './DragBox.js';
+import {
+  createOrUpdateFromCoordinates,
+  getBottomLeft,
+  getCenter,
+  getTopRight,
+  scaleFromCenter,
+} from '../extent.js';
 import {easeOut} from '../easing.js';
 import {shiftKeyOnly} from '../events/condition.js';
-import {createOrUpdateFromCoordinates, getBottomLeft, getCenter, getTopRight, scaleFromCenter} from '../extent.js';
-import DragBox from './DragBox.js';
-
 
 /**
  * @typedef {Object} Options
@@ -21,7 +26,6 @@ import DragBox from './DragBox.js';
  * `boxEndCondition` function.
  */
 
-
 /**
  * @classdesc
  * Allows the user to zoom the map by clicking and dragging on the map,
@@ -45,7 +49,7 @@ class DragZoom extends DragBox {
       condition: condition,
       className: options.className || 'ol-dragzoom',
       minArea: options.minArea,
-      onBoxEnd: onBoxEnd
+      onBoxEnd: onBoxEnd,
     });
 
     /**
@@ -62,7 +66,6 @@ class DragZoom extends DragBox {
   }
 }
 
-
 /**
  * @this {DragZoom}
  */
@@ -76,23 +79,25 @@ function onBoxEnd() {
     const mapExtent = view.calculateExtentInternal(size);
     const boxPixelExtent = createOrUpdateFromCoordinates([
       map.getPixelFromCoordinateInternal(getBottomLeft(extent)),
-      map.getPixelFromCoordinateInternal(getTopRight(extent))]);
+      map.getPixelFromCoordinateInternal(getTopRight(extent)),
+    ]);
     const factor = view.getResolutionForExtentInternal(boxPixelExtent, size);
 
     scaleFromCenter(mapExtent, 1 / factor);
     extent = mapExtent;
   }
 
-  const resolution = view.getConstrainedResolution(view.getResolutionForExtentInternal(extent, size));
+  const resolution = view.getConstrainedResolution(
+    view.getResolutionForExtentInternal(extent, size)
+  );
   const center = view.getConstrainedCenter(getCenter(extent), resolution);
 
   view.animateInternal({
     resolution: resolution,
     center: center,
     duration: this.duration_,
-    easing: easeOut
+    easing: easeOut,
   });
 }
 
-
 export default DragZoom;