Add WIFI_SCANNING_SETTINGS action to Settings

- Export the interface for System UI to launch Wi-Fi Scanning Settings.

Bug: 202323013
Test: manual test by adb to launch Wi-Fi scanning settings below
adb shell am start -a android.settings.WIFI_SCANNING_SETTINGS

Change-Id: I893d3cea40d1f3ed4a962009416f54c99a91e11f

src/com/android/settings/Settings.java

@@ -166,6 +166,7 @@ public class Settings extends SettingsActivity {
     public static class AppUsageAccessSettingsActivity extends SettingsActivity { /* empty */ }
     public static class LocationSettingsActivity extends SettingsActivity { /* empty */ }
     public static class ScanningSettingsActivity extends SettingsActivity { /* empty */ }
+    public static class WifiScanningSettingsActivity extends SettingsActivity { /* empty */ }
     public static class PrivacyDashboardActivity extends SettingsActivity { /* empty */ }
     public static class PrivacySettingsActivity extends SettingsActivity { /* empty */ }
     public static class FactoryResetActivity extends SettingsActivity {

src/com/android/settings/core/gateway/SettingsGateway.java

@@ -112,6 +112,7 @@ import com.android.settings.language.LanguageAndInputSettings;
 import com.android.settings.localepicker.LocaleListEditor;
 import com.android.settings.location.LocationServices;
 import com.android.settings.location.LocationSettings;
+import com.android.settings.location.WifiScanningFragment;
 import com.android.settings.network.MobileNetworkListFragment;
 import com.android.settings.network.NetworkDashboardFragment;
 import com.android.settings.network.NetworkProviderSettings;
@@ -201,6 +202,7 @@ public class SettingsGateway {
             ProcessStatsUi.class.getName(),
             NotificationStation.class.getName(),
             LocationSettings.class.getName(),
+            WifiScanningFragment.class.getName(),
             PrivacyDashboardFragment.class.getName(),
             LocationServices.class.getName(),
             SecuritySettings.class.getName(),