Start of Update messages builder class implementation & usage for Input group updates

libsignal/src/main/java/org/session/libsignal/service/api/messages/SignalServiceGroup.java

@@ -37,7 +37,11 @@ public class SignalServiceGroup {
     UPDATE,
     DELIVER,
     QUIT,
-    REQUEST_INFO
+    REQUEST_INFO,
+    NEW_GROUP,
+    NAME_CHANGE,
+    MEMBER_ADDED,
+    MEMBER_REMOVED
   }
 
   private final byte[]                            groupId;