[Provider Model] Implement the carrner network selection settings

- Add WifiPickerTrackerHelper to reuse the library

- User taps on carrier network preference
  - Calls MergedCarrierEntry#connect()

- User toggles mobile data On/Off
  - Calls MergedCarrierEntry#setEnabled(true/false)

Bug: 175761096
Test:
- Manual Test
- atest NetworkMobileProviderControllerTest \
        SubscriptionsPreferenceControllerTest \
        WifiPickerTrackerHelperTest

Change-Id: Ia311b10ca7a44a536556c1889ee65743af379822

src/com/android/settings/network/NetworkMobileProviderController.java

@@ -24,6 +24,7 @@ import androidx.preference.PreferenceCategory;
 import androidx.preference.PreferenceScreen;
 
 import com.android.settings.core.BasePreferenceController;
+import com.android.settings.wifi.WifiPickerTrackerHelper;
 import com.android.settingslib.core.lifecycle.Lifecycle;
 
 /**
@@ -115,4 +116,10 @@ public class NetworkMobileProviderController extends BasePreferenceController im
         }
         mPreferenceCategory.setVisible(available);
     }
+
+    public void setWifiPickerTrackerHelper(WifiPickerTrackerHelper helper) {
+        if (mSubscriptionsController != null) {
+            mSubscriptionsController.setWifiPickerTrackerHelper(helper);
+        }
+    }
 }