RTT outgoing initialization

Add support for dialing an outgoing call with RTT enabled from the start
    (refactors the dial methods to use DialArgs)
Add plumbing code to bubble up RTT initiation/termination events from
the IMS stack up to Telecom

Bug: 72156722
Bug: 71873552
Test: existing unit tests

Change-Id: I084f75d860ebc9837cf6156c1ebaaf4532343de1
Merged-In: I084f75d860ebc9837cf6156c1ebaaf4532343de1