add transactional call state verifier

A bugreport came in that demonstrated if a self-managed call does not
call Connection#setOnHold in Connection#hold, a new sim call can drop.
Telecom does not verify call state changes for ConnectionService calls
and it's assumed that self-managed implementations are correct.
However, since the consequence of a bad implmentation results in a
dropped sim call there is now a need to verify call state changes.

This change adds the capability for Telecom to verify callback call
state changes. This specific change verifies that when Telecom requests
a hold, the app hosting the call has 2 seconds to call setOnHold or the
call will be disconnected.

Test: 2 unit tests + 2 manual tests:
        Test fail case:
	(1) comment out setOnHold() in SelfManagedConnection#onHold()
        (2) start a SM call in the Self-Managed Sample APP
        (3) set the call active
        (4) open the Test InCall UI activity
        (5) click the hold button
        expect: The call to be disconnected b/c setOnHold is not called
	Test pass case:
        (1) start a SM call in the Self-Managed Sample APP
        (2) set the call active
        (3) open the Test InCall UI activity
        (4) click the hold button
        expect: The call to be held and not disconnected. Also
           The underlying transaction to be successful and listener
	   to be removed.
Fixes: b/267234374
Change-Id: I30908fdce852112bd4ccbe6162bbd541d546e8a6