Add block uninstall delegation in DPMS.

Implement the uninstall blocker delegation scope API in
DevicePolicyManagerSercice.

This feature gives a device owner or profile owner the ability to
delegate some of its privileges to another application.

Bug: 33105718
Test: cts-tradefed run cts-dev --module CtsDevicePolicyManagerTestCases --test com.android.cts.devicepolicy.MixedDeviceOwnerTest#testDelegation
Change-Id: Ieb347ce3fb6219fe7f04cafbcd1e6b7359b31a10