Iniital import of unicode-normalization v0.1.16 am: 12bf0863fe am: 1721046199 am: 4dc50db10c

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/unicode-normalization/+/1533349

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ibc6773fc391d4f0f4c716f753fca00681e27fb02