readd the createdTime member

source/RobotAPI/libraries/armem/core/base/EntityInstanceBase.h

@@ -23,6 +23,8 @@ namespace armarx::armem::base
     struct EntityInstanceMetadata
     {
         /// Time when this value was created.
+        Time createdTime;
+        /// Time when this value is referenced to.
         Time referencedTime;
         /// Time when this value was sent to the memory.
         Time sentTime;