Added feature for surveys provider to Settings

It is now possible to create and show surveys to a user
asking them for feedback within the Settings app.

Test: JUnitTests
Bug: 27823357
Change-Id: I824899045f6ce30e5b6f46d20888da673114f658

src/com/android/settings/overlay/FeatureFactoryImpl.java

@@ -110,4 +110,9 @@ public class FeatureFactoryImpl extends FeatureFactory {
         }
         return mSearchFeatureProvider;
     }
+
+    @Override
+    public SurveyFeatureProvider getSurveyFeatureProvider(Context context) {
+        return null;
+    }
 }