Merge "Add method for reading stats by iface index" into main am: 8cd07eda

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2694686



Change-Id: Iacc37078661adbfc21498a84208daac56032a344
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>