Add Slices for Enhanced 4G LTE

Add Slices for Enhanced 4G LTE
Enhanced 4G LTE Slice Provider:
Create slice to display appropriate message with further instructions
Enhanced 4G LTE Slice Broadcast Reciver:
1. Change the setting via ImsManager
2. Ask to requery the slice in one second to display updated settings if 1 is valid or display appropriate message

Bug: 79270171
Test: Robotests
Test: Use support-slices-demos-debug.apk to test on device
Change-Id: I48d412de94d5d9f1ad42a299691ec5cf8001c6a1

src/com/android/settings/slices/SlicesFeatureProvider.java

@@ -2,6 +2,7 @@ package com.android.settings.slices;
 
 import android.content.Context;
 
+import com.android.settings.mobilenetwork.Enhanced4gLteSliceHelper;
 import com.android.settings.wifi.calling.WifiCallingSliceHelper;
 
 /**
@@ -31,4 +32,10 @@ public interface SlicesFeatureProvider {
      * Gets new WifiCallingSliceHelper object
      */
     WifiCallingSliceHelper getNewWifiCallingSliceHelper(Context context);
+
+    /**
+     * Gets new Enhanced4gLteSliceHelper object
+     */
+    Enhanced4gLteSliceHelper getNewEnhanced4gLteSliceHelper(Context context);
 }
+