chore: declare the name element (googleapis#1891)

The pom.xml doesn't have the name element.

Author: suztomo

datastore-v1-proto-client/pom.xml

@@ -28,6 +28,7 @@
   </parent>
 
   <packaging>jar</packaging>
+  <name>datastore-v1-proto-client</name>
   <description>
     Low level client for accessing Google Cloud Datastore v1.
   </description>