[Settings] Apply ImsQueryProvisioningStat to WFC

1. Code refactor
2. Apply ImsQueryProvisioningStat class to WFC's use case

Bug: 140542283
Test: m RunSettingsRoboTests -j ROBOTEST_FILTER=WifiCallingPreferenceControllerTest
Change-Id: I8a09264f83b9fc4fce3f79ec3aeb6ae757b004e4
8 files changed