Convert Flipper plugin "Network" to TypeScript

Summary: _typescript_

Reviewed By: danielbuechele

Differential Revision: D17155509

fbshipit-source-id: 45ae3e2de8cd7b3cdf7271905ef7c318d4289391

types/XmlBeautifier.d.tsx

@@ -0,0 +1,10 @@
+/**
+ * Copyright 2018-present Facebook.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ * @format
+ */
+
+declare module 'xml-beautifier' {
+  export default function(xml: string, indent?: string): string;
+}