Add a script to prepare a Bazel environment am: 52534a2703 am: 7ddda3ee6c am: db5ca8a0c9 am: 2919da26e0

Original change: https://android-review.googlesource.com/c/platform/build/pesto/+/1677130

Change-Id: Id951781fb8942d0dffe8ca8f22bc3af168b989a4
tree: 9b1fcaaa73ea317a369daf80e024642014d7fb70
  1. experiments/
  2. OWNERS