feat(server): Move wepback require code split

Clean up server code

server/utils/webpack-code-split-polyfill.js

@@ -0,0 +1,18 @@
+export default function codeSplitPolyfill() {
+  // polyfill for webpack bundle splitting
+  const requireProto = Object.getPrototypeOf(require);
+  if (!requireProto.hasOwnProperty('ensure')) {
+    Object.defineProperties(
+      requireProto,
+      {
+        ensure: {
+          value: function ensure(modules, callback) {
+            callback(this);
+          },
+          writable: false,
+          enumerable: false
+        }
+      }
+    );
+  }
+}