Share contact look up between call log and call details.

Currently, it is possible to get a contact be correctly identified in
the call log, but not in the details, because the logic to do the
look-up are completely separate.

For example, SIP contacts are correctly looked up by the call log, but
not by the details. Moreover, we recently fixed a few bugs in the logic
for looking up contacts in the call log, that have not been propagated
to the call details because the code is independent.

This commit moves the whole logic of looking up a contact given a number
(which may be a SIP number) from the CallLogAdapter into its own class.
Then, CallDetailActivity can use that to look up the contact in a way
that is guaranteed to yield the same result.

Bug: 5415134
Change-Id: I73acc39ba5dc65ecce6861f210224304fd91822d