updater_sample: add streaming support

- UpdateConfigs: add helper methods for streaming
- add PrepareStreamingService intent service

Test: manually and junit4
Bug: 77148143
Change-Id: I61711eb9abe051987e725fbd94f8cd029ff21dd3
diff --git a/updater_sample/AndroidManifest.xml b/updater_sample/AndroidManifest.xml
index 5bbb21c..4b44484 100644
--- a/updater_sample/AndroidManifest.xml
+++ b/updater_sample/AndroidManifest.xml
@@ -31,6 +31,7 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+        <service android:name=".services.PrepareStreamingService"/>
     </application>
 
 </manifest>