Add admin consent cross-profile package APIs

Add DevicePolicyManager#setCrossProfilePackages and
DevicePolicyManager#getCrossProfilePackages. This provides admin consent
for apps that can ask for user consent to communicate cross-profile.

Some Javadoc can be improved once all CLs are in, since different APIs
should refer to each other.

BUG: 136249261
BUG: 144577776
BUG: 141690885
BUG: 145970297
TEST: atest com.android.server.devicepolicy.DevicePolicyManagerTest
Change-Id: I3f931bb7c1d5e490d04e5450f3010465ed6a5dc6