Initial import of form_urlencoded v1.0.0 am: 6d73de0679

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/form_urlencoded/+/1533346

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ibd7bfcd77a609a881c254b31072e0f8494efd63f