Add a new time zone detection service

Add a new time zone detection service. Much of the code is from
frameworks/opt/telephony with some changes for naming, threading and
to modify the interaction with the "Callback" class.

Overall goal:

Implementing the service in the system server means it will be easier to
add new time zone detection logic unrelated to telephony in future.

Bug: 140712361
Test: atest com.android.server.timezonedetector
Test: atest android.app.timezonedetector
Change-Id: I89505fc4fecbd3667b60f8e1479b8f177eaa60ae
Merged-In: I89505fc4fecbd3667b60f8e1479b8f177eaa60ae
(cherry picked from commit 3e3b5405)