[Wi-Fi] Add a new fragment for configuring a new AccessPoint network.

When configuring a new access point in Wi-Fi settings page, it's hard to figure out there are some other option items after you tapping the "Advanced options" button.

To improve it, use full screen fragment to present the configuration items, so user can see as many items as possible.

Bug: 31052996
Test: Mock this fragment and check each button status run as expected.
Change-Id: I1c8e552fcabb1414bb500d918ed61287bf4aece2