Add allowlist mechanism for battery optimization mode

Add a mechanism to add package name into the allowlist to avoid users
change the battery optimization modes for specific apps in the list

https://screenshot.googleplex.com/8hrHCcTh5bNYXqp

Bug: 281566984
Test: make test RunSettingsRoboTests ROBOTEST_FILTER=com.android.settings.fuelgauge.*
Change-Id: I8efa6a55646d761f5bee3667a59b38ab68c74bc1

src/com/android/settings/fuelgauge/BatteryOptimizeUtils.java

@@ -31,11 +31,14 @@ import android.util.Log;
 
 import androidx.annotation.VisibleForTesting;
 
+import com.android.settings.R;
 import com.android.settings.fuelgauge.BatteryOptimizeHistoricalLogEntry.Action;
 import com.android.settingslib.fuelgauge.PowerAllowlistBackend;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
+import java.util.Arrays;
+import java.util.List;
 
 /** A utility class for application usage operation. */
 public class BatteryOptimizeUtils {
@@ -214,6 +217,11 @@ public class BatteryOptimizeUtils {
                 || powerAllowlistBackend.isDefaultActiveApp(packageName, uid);
     }
 
+    static List<String> getAllowList(Context context) {
+        return Arrays.asList(context.getResources().getStringArray(
+                R.array.config_disable_optimization_mode_apps));
+    }
+
     private static void setAppUsageStateInternal(
             Context context, @OptimizationMode int mode, int uid, String packageName,
             BatteryUtils batteryUtils, PowerAllowlistBackend powerAllowlistBackend,