Add assisted dialing properties to the framework.

These properties allow the feature to be propogated from
the outgoing call broadcast, to the connection, to the call,
and finally to the call log as a feature.

Test: no existing unit tests found. could use some pointers
Bug: 35963245
Merged-In: I84343fb0cda16514c01997fd71d1e819b5b7eebb
Change-Id: I086e761ada9a57dca61c3a412561ee54255d6260