Revert "Removes EphemrealResolverService and related"

This reverts commit 5564f880db3292327872a07df8e230eee78be14b.

Reason for revert: Resolve merge conflict for another revert (ag/3537193)
Bug: 72710855
Change-Id: Id7c3a3993a45c588ee4668d7486d67d764541b1e
10 files changed