Add async-trait/OWNERS am: d4f23d094d am: 959f004946 am: 8bbcac5e46 am: e8b9360b83

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/async-trait/+/1429105

Change-Id: I87e38cb1b03d3850d52aad2893bc9f231b71da95