Implement DELEGATION_PACKAGE_INSTALLATION

Previously a Device Owner or an affliated Profile Owner of the DO can silently
install APKs via PackageInstaller APIs. This CL additionally grants delegates
of DO the same access.

Bug: 112982695
Test: atest com.android.cts.devicepolicy.MixedProfileOwnerTest#testDelegation
Test: atest com.android.cts.devicepolicy.MixedDeviceOwnerTest#testDelegation
Test: atest com.android.cts.devicepolicy.MixedManagedProfileOwnerTest#testDelegation
Change-Id: I777ee6aa1ecd036ee56270fc6b4e86b74d1042a6