Add BUILD.bazel for bundletool. am: 9e0874fb8a am: 462a505a26 am: 1ca3da6d72

Original change: https://android-review.googlesource.com/c/platform/prebuilts/bundletool/+/2004876

Change-Id: Ib9dfc16cf9798f5e2da59b9822c89ef3787ce79e