Minimum viable TimeZoneDetectorService

This is a do-nothing TimeZoneDetectorService that can be
populated in following commits. A temporary method has been
added so the service has one method.

Unit tests can be run with:

atest FrameworksServicesTests:TimeZoneDetectorServiceTest

Test: build / boot
Test: See above
Merged-In: I565fb5dd2f18b7aac2e5779d346bfe69e9da02af
Change-Id: I565fb5dd2f18b7aac2e5779d346bfe69e9da02af