Implement Discovery PLATFORM logic in Rust am: 3521a5ed8a

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2736090

Change-Id: If2bc89d5caaac287c4deb32c832390fffa4e77ad
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>