Add BUILD.bazel for bundletool. am: 9e0874fb8a am: 462a505a26 am: 1ca3da6d72 am: 392c25154a

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

Change-Id: I68f15c26c814e012c6a90d701fa70bf5a3eacdc6