Migrate to cargo_embargo. am: db112fb0d2 am: b164c86232 am: f059fe77dd

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/percent-encoding/+/2829798

Change-Id: I8489b02ce0313a233b65a1e3c8239bbc8435c729
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>