[Provider Model] View airplane mode networks button

- Airplane mode message
  - WiFi Disable: “Airplane mode is on”
  - WiFi Enabled: “Viewing airplane mode networks”

- “View airplane mode networks” button
  - WiFi Disable: “View airplane mode networks”
  - WiFi Enabled: hide button

- Screenshot
  https://screenshot.googleplex.com/7PuKwaJMLpiDdKh

Bug: 177155647
Test: manual test
- atest ViewAirplaneModeNetworksLayoutPreferenceControllerTest
- make RunSettingsRoboTests ROBOTEST_FILTER=NetworkProviderSettingsTest

Change-Id: I3222cb04a66d07681709cc95b729b5ecdf999298