[Settings] add VtQueryImsState for IMS
1. Code refactor 2. Introduce VtQueryImsState and VolteQueryImsState for user enable/disable configuration Bug: 140542283 Test: m RunSettingsRoboTests -j ROBOTEST_FILTER=VideoCallingPreferenceControllerTest Change-Id: I72ec009a8808875fef144a24486b94ef4a7fd35c
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