Extract QualifiedTelephonyTimeZoneSuggestion to its own file.

Moves the `QualifiedTelephonyTimeZoneSuggestion` inner class from `TimeZoneDetectorStrategyImpl` into a new top-level file and converts it to a Java record.

This will be used by the Fused Time Zone Detector (FTZD) as well, so a separate file seems appropriate.

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: I1beae9fb9262347291fc2bf5e1d06359af3ca42b