[Wi-Fi] Branch WifiDialog files for WifiTracker2 development

Add these files:

  WifiConfigController2.java
  WifiConfigUiBase2.java
  WifiDialog2.java

  WifiConfigController2Test.java
  WifiDialog2Test.java

Bug: 146407136
Test: compile
Change-Id: I0689ae8ddee4f35e3bc104fd0b2e94eb8f689630
5 files changed