Allow external apps to start pre-call flow

This CL adds an activity that will forward parameters to PreCall so external apps like contact can utilize SIM selection or assisted dialing features. The caller needs to have CALL_PHONE permission.

Bug: 64213352
Test: LaunchPreCallActivityTest
PiperOrigin-RevId: 175591732
Change-Id: I096ea022d5ed87c29ffb191cd1bdb04e3a17c945
3 files changed