Prepare for migration to the time detector service

Paves the way for moving more behavior to the time detector
service from the NetworkTimeUpdateService.

The NewNetworkTimeUpdateService is effectively identical to
the OldNetworkTimeUpdateService in this initial commit.

Bug: 78217059
Test: build / boot
Merged-In: Ica9fa9b61c849e034d76c0faae5693b60a4a197f
Change-Id: Ica9fa9b61c849e034d76c0faae5693b60a4a197f