Migrate to cargo_embargo. am: 99d47778c2 am: c4ee55ada0 am: 132bdf24f8

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/unicode-width/+/2828074

Change-Id: I32b2da636fe01a3fe67e6ebe339992b87e52d777
Signed-off-by: Automerger Merge Worker <[email protected]>