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.

config/jsdoc/info/api-plugin.js

@@ -1,15 +1,11 @@
-
-
 /**
  * Handle the api annotation.
  * @param {Object} dictionary The tag dictionary.
  */
-exports.defineTags = function(dictionary) {
-
+exports.defineTags = function (dictionary) {
   dictionary.defineTag('api', {
-    onTagged: function(doclet, tag) {
+    onTagged: function (doclet, tag) {
       doclet.api = true;
-    }
+    },
   });
-
 };