[ProviderModel] Add InternetDialog for showing current networks

    - Set mobile data layout
    - Set connected Wi-Fi layout
    - Set recycle view and adapter for Wi-Fi entries
    - Add InternetDialogTest for unit test

UX design: https://screenshot.googleplex.com/Bniie5mSwm8XXDg.png
Screenshot:
 - Mobile Data is connected: https://screenshot.googleplex.com/Bi8kYPGCHzdz6bJ.png
 - Wi-Fi is connected: https://screenshot.googleplex.com/8xiLHt3wPjFva5J.png

Bug: 187779230
Test: atest InternetDialogTest
Change-Id: I0abc2ebdfb635f2c2aedeb40daf36f05acbced00