Move NetIdManager and ProfileNetworkPreferences from services/core to
packages/Connectivity/service.
This is a partial cherry-pick of a downstream change.
Bug: 186628461
Test: m
Merged-In: I454e8a0a8d0e0f9e6d21a8e8faf5a9e299962ad4
Change-Id: I6734c181dac39518b8d69be1e49d7f5f0a0a18da