[Provider Model] Implement the carrner network selection

- Add primaryAction for connecting carrier network

- User toggles carrier network On/Off
  - Calls MergedCarrierEntry#setEnabled(true/false)

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

Bug: 175761096
Test:
- Manual Test
- atest ProviderModelSliceTest
- atest ProviderModelSliceHelperTest
- make RunSettingsRoboTests ROBOTEST_FILTER=WifiScanWorkerTest

Change-Id: I07cb6c142a2f4e9cbdbab1f77afdc367728b4e3f

src/com/android/settings/wifi/slice/WifiScanWorker.java

@@ -36,6 +36,7 @@ import androidx.lifecycle.LifecycleRegistry;
 
 import com.android.settings.slices.SliceBackgroundWorker;
 import com.android.settingslib.utils.ThreadUtils;
+import com.android.wifitrackerlib.MergedCarrierEntry;
 import com.android.wifitrackerlib.WifiEntry;
 import com.android.wifitrackerlib.WifiEntry.WifiEntryCallback;
 import com.android.wifitrackerlib.WifiPickerTracker;
@@ -199,4 +200,18 @@ public class WifiScanWorker extends SliceBackgroundWorker<WifiSliceItem> impleme
         }
         super.updateResults(resultList);
     }
+
+    public void setCarrierNetworkEnabled(boolean enable) {
+        final MergedCarrierEntry mergedCarrierEntry = mWifiPickerTracker.getMergedCarrierEntry();
+        if (mergedCarrierEntry != null) {
+            mergedCarrierEntry.setEnabled(enable);
+        }
+    }
+
+    public void connectCarrierNetwork() {
+        final MergedCarrierEntry mergedCarrierEntry = mWifiPickerTracker.getMergedCarrierEntry();
+        if (mergedCarrierEntry != null && mergedCarrierEntry.canConnect()) {
+            mergedCarrierEntry.connect(null /* ConnectCallback */);
+        }
+    }
 }