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
Change-Id: I3ed8ac5ad7300c44f87e2573d9409b3a92b98ab6
Merged-In: I84343fb0cda16514c01997fd71d1e819b5b7eebb