Make TelephonyTimeZoneSuggestion carry TelephonySignal

This is needed to be able to record information like the MCC/MNC and Nitz in the suggestion metadata. This will later be used in the Fused Time Zone Detector.

go/android-tz-detector
go/ftzd-algo
go/ftzd-cases
go/ftzd-scenarios

Test: atest FrameworksTimeCoreTests
Test: atest FrameworksTimeServicesTests
Test: atest FrameworksTelephonyTests
Flag: android.timezone.flags.enable_fused_time_zone_detector
Bug: 394770805
Change-Id: I660c5a8cc1379396f8cb1031c810dd1c4304ce0d