Pipe through new SipTransport IInterface to listeners

Create base SipTransport implementation and make it available to
listeners.

Expose new SipDelegate creation capability to the framework from the
ImsService.

The next CL will start the integration of the SipDelegateManager
with the framework and SipTransport.

Bug: 154763999
Test: atest FrameworksTelephonyTests TeleServiceTests
Merged-In: I9a51b850f370a865c9d9109f238e8ed2eea4b6f6
Change-Id: I9a51b850f370a865c9d9109f238e8ed2eea4b6f6