Hermes: Create prepare-hermes-for-build.js script

Summary:
Adds a script that uses the new hermes-utils.js functions to prepare the local filesystem for Hermes to be built from source (e.g. download the Hermes source code tarball and extract it into its final location).

Changelog: [Internal]

Reviewed By: cortinico

Differential Revision: D36334624

fbshipit-source-id: 012f758ecda07931bdb0ab1728b87733bf5af16a

Author: hramos

scripts/hermes/prepare-hermes-for-build.js

@@ -0,0 +1,24 @@
+/**
+ * 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
+ */
+
+'use strict';
+
+/**
+ * This script prepares Hermes to be built as part of the
+ * iOS build pipeline on macOS.
+ */
+const {
+  copyBuildScripts,
+  downloadHermesTarball,
+  expandHermesTarball,
+} = require('./hermes-utils');
+
+downloadHermesTarball();
+expandHermesTarball();
+copyBuildScripts();