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/jest.config.js

@@ -1,14 +0,0 @@
-/**
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @format
- */
-
-module.exports = {
-  setupFiles: ["./jest.setup.js", "./tests/tools.js"],
-  testRegex: "/tests/.*\\.test\\.js$",
-  watchman: false,
-};