Replace NPMI#isUidNetworkingBlocked()

ConnectivityService is going to become a mainline module which
will not able to access hidden APIs. NetworkPolicyManagerInternal
is a internal serivce that CS can't be access after be a mainline
module. Thus, create NPM#checkUidNetworkingBlocked to replace it.

Bug: 170598012
Test: atest FrameworksNetTests
Test: atest CtsNetTestCases
Test: atest CtsHostsideNetworkTests
Test: atest FrameworksCoreTests:NetworkPolicyManagerTest
Test: atest FrameworksServicesTests:NetworkPolicyManagerServiceTest
Change-Id: I7bee37522dc5c55c255b159fda9481eff663655a