Add ability to add sim-initiated MO call to UI (3/4)

Pipe an unknown call through CallsManager via various new APIs like
onSuccessfulUnknownCall, onFailedUnknownCall, etc. These are the unknown call's
equivalent of onSuccessfulOutgoingCall and onFailedOutgoingCall.

Only the TelephonyConnectionService is allowed to call this hidden new API
in Telecom.

Also add the ability for TestConnectionService to test this API (although the
check for TelephonyConnectionService must be disabled at build time first).

Bug: 16852844
Change-Id: I5dfdfc1bd4675f6b300a4a55a3098582f9d715a2