Replace ChangeDefaultDialerDialog with RequestRoleActivity.

For apps targeting pre-Q, we allow specifying the package name of the
application itself, or another package name if the calling app is the
current default dialer app. For apps targeting Q or later, we'll
cancel the activity launch in ActivityStackSupervisor.

Bug: 124452117
Bug: 131204827
Test: presubmit
Change-Id: I4ec52108321903b3875007246a95b434172849c1