Added RealtimeRowProcessor.

This is for performing work inside of the call log's RecyclerView, when the view holder is bound. Most of the time, this should be a no-op but there are possible edge cases where the call log data cannot be updated efficiently through the standard batch mechanism.

One example of this is when there are too many invalid numbers in the call log; the CP2 information for invalid numbers cannot be efficiently batch updated so we fetch this information at display time. (Note that we do handle up to 5 invalid numbers in the batch update mechanism, but if there are more than that we fallback to this realtime processing.)

Test: unit, manual
PiperOrigin-RevId: 181400016
Change-Id: Iea6b380742e757b48d19f319fe46dc5fae837604