Added telemtery express counter to track explicit uri grants

The counter monitors cases where the activity starter is explicitly set the uri grant. This statistic will reveal potential app compatibility problems that may arise once the explicit grant is removed.

Bug: 239417868
Bug: 295238578
Test: manual + pre-submit
Flag: EXEMPT bugfix

Change-Id: I99a2b0aff6bb2376bacd6072816824cc44aa0625