[Wi-Fi] Add multiple networks request case for adding Wi-Fi for apps feature.

Handle adding multiple networks case, add UI components and process saving flow.

Bug: 136472483
Test: Add unit test cases to test filterSavedNetworks API.
Change-Id: I222e2f8294793796e293de49acdb96ecd6a57b0d
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 3f66cb8..03be75f 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -3058,6 +3058,7 @@
                   android:theme="@style/Theme.Panel"
                   android:launchMode="singleInstance"
                   android:excludeFromRecents="true"
+                  android:configChanges="orientation|keyboardHidden|screenSize"
                   android:permission="android.permission.CHANGE_WIFI_STATE">
             <intent-filter>
                 <action android:name="android.settings.WIFI_ADD_NETWORKS" />