Expose grantImplicitAccess in IPackageManager

This change exposes the method to grant implicit visibility access via
IPackageManager and as a hidden API in PackageManager. This variant of
the method takes a recipient UID and the authority that it should see
and limits access to only the contacts provider on device.

Bug: 158688602
Test: PackageManagerTests
Change-Id: I0050593e4aa734af1a69a40a60746f7cf0ea72df