Add OWNERS and fix METADATA file. am: 5403d046c0 am: 1a019f6318 am: 638ff63403 am: c9e4ae2e45

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/remove_dir_all/+/1888779

Change-Id: I14ae68d336a14546888457df184abf4d747cebba