Add types to scripts and config files

Summary:
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.

Differential Revision: D45511176

fbshipit-source-id: 541b967a276d2894e68b505169fc69096589d8c4

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);