Fix UMD commonjs support

This is based on the UMDJS jQuery template available at
https://github.com/umdjs/umd/blob/95563fd6b46f06bda0af143ff67292e7f6ede6b7/templates/jqueryPlugin.j://github.com/umdjs/umd/blob/95563fd6b46f06bda0af143ff67292e7f6ede6b7/templates/jqueryPlugin.js

This closes https://github.com/select2/select2/issues/4557.
This closes https://github.com/select2/select2/pull/4558.

src/js/wrapper.start.js

@@ -9,15 +9,30 @@
   if (typeof define === 'function' && define.amd) {
     // AMD. Register as an anonymous module.
     define(['jquery'], factory);
-  } else if (typeof exports === 'object') {
+  } else if (typeof module === 'object' && module.exports) {
     // Node/CommonJS
-    factory(require('jquery'));
+    module.exports = function (root, jQuery) {
+      if (jQuery === undefined) {
+        // require('jQuery') returns a factory that requires window to
+        // build a jQuery instance, we normalize how we use modules
+        // that require this pattern but the window provided is a noop
+        // if it's defined (how jquery works)
+        if (typeof window !== 'undefined') {
+          jQuery = require('jquery');
+        }
+        else {
+          jQuery = require('jquery')(root);
+        }
+      }
+      factory(jQuery);
+      return jQuery;
+    };
   } else {
     // Browser globals
     factory(jQuery);
   }
-}(function (jQuery) {
+} (function (jQuery) {
   // This is needed so we can catch the AMD loader configuration and use it
   // The inner file should be wrapped (by `banner.start.js`) in a function that
   // returns the AMD loader references.
-  var S2 =
+  var S2 =