[ADI][metrics] implement metrics collection

FLAG: android.content.pm.verification_service
BUG: 418283971
Test: atest com.android.server.pm.verify.developer.DeveloperVerifierControllerTest
Test: manual; cts-root tests to be added in followup CLs.

Change-Id: Ifddce068e190cccec1fef72ce4111e69c5153d0d