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/proj/transforms.js

@@ -3,14 +3,12 @@
  */
 import {isEmpty} from '../obj.js';
 
-
 /**
  * @private
  * @type {!Object<string, Object<string, import("../proj.js").TransformFunction>>}
  */
 let transforms = {};
 
-
 /**
  * Clear the transform cache.
  */
@@ -18,7 +16,6 @@ export function clear() {
   transforms = {};
 }
 
-
 /**
  * Registers a conversion function to convert coordinates from the source
  * projection to the destination projection.
@@ -36,7 +33,6 @@ export function add(source, destination, transformFn) {
   transforms[sourceCode][destinationCode] = transformFn;
 }
 
-
 /**
  * Unregisters the conversion function to convert coordinates from the source
  * projection to the destination projection.  This method is used to clean up
@@ -57,7 +53,6 @@ export function remove(source, destination) {
   return transform;
 }
 
-
 /**
  * Get a transform given a source code and a destination code.
  * @param {string} sourceCode The code for the source projection.