Merge "Add directory for external crate tool, with OWNERS file." into main am: 55ab781f74

Original change: https://android-review.googlesource.com/c/platform/development/+/3089565

Change-Id: Id73b4fc5d4dd22ea4d0ec0571db390140e9202e1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>