Add types to scripts and config files (#1277)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1277

Now that we have some TypeScript infra set up, move scripts (mainly the benchmarking one) and config files to TypeScript.

Starts to move away a bit from the magic globals used in the JS environment.

Reviewed By: yungsters

Differential Revision: D45511176

fbshipit-source-id: 09bb1117a1b331758ed9d210e82d5b250577df81

javascript/tests/YGMeasureCacheTest.test.js

@@ -5,6 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+import { getMeasureCounterMax } from "./tools/MeasureCounter";
+
 test("measure_once_single_flexible_child", () => {
   const root = Yoga.Node.create();
   root.setFlexDirection(Yoga.FLEX_DIRECTION_ROW);