Add list of Administrator UIDs to NetworkCapabilities.

Adds a list of administrator UIDs to NetworkCapabilties. The carrier
privilege permission model allows multiple uids to be granted
network-management privileges via certificates stored on a SIM card or
in CarrierConfigManager. The current NetworkCapabilities only allows a
single uid to be stored to track the owner of the network - this change
remedies that discrepancy.

Bug: 147903575
Test: atest FrameworksNetTests
Change-Id: I3169d31e0270c976a720e80363cb268cbafd0455