Timestamp is not recorded #6
Description
Currently we do not properly record the timestamp of events written.
While this is more or less in line with batching journal, we should be collecting timestamp when WriteMessagesAsync is called and attaching to a form of IPersistentRepresentation. The current form however does not provide a Timestamp field.
We may want to use a Class holder in place of 'IPersistentRepresentation for this case.