Add a function to query enforceDnsUid setting am: 37ade6cc am: 2bf32330...

Add a function to query enforceDnsUid setting am: 37ade6cc am: 2bf32330 am: a34dd4f4 am: c2c0a7f8

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/2753509



Change-Id: Ic2d6407a60dbf82890d82168369076dfb00c94e8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>