Add nested toggle switches under Adaptive connectivity settings UI

Bug: 393645580
Flag: com.android.settings.flags.enable_nested_toggle_switches
Test: Manual testing
atest AdaptiveConnectivityScreenTest
hsv: https://hsv.googleplex.com/5165236934934528

Change-Id: I12403f5c80290ebccc04f11771ec3f06ee216610