Add NtpTimeHelper

- Refactor GnssLocationProvider around handleInjectNtpTime
- Add robolectric test for NtpTimeHelper

Bug: 73319937
Test: m -j ROBOTEST_FILTER=NtpTimeHelperTest RunFrameworksServicesRoboTests

Change-Id: Ie551a64641b03386c00cb2de5bbaee41150cc40c
4 files changed