Convert Flipper plugin "DeviceCPU" to TypeScript

Summary: Migrate CPU plugin to use TypeScript

Reviewed By: danielbuechele

Differential Revision: D17072709

fbshipit-source-id: d9acf172af08d764216e7b79b79994199dc83f5c

types/adbkit-fb.d.tsx

@@ -0,0 +1,12 @@
+/**
+ * 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 'adbkit-fb' {
+  const util: any;
+  const adbkit: any;
+  export function createClient({port: number, host: string}): any;
+}