add transaction's final_lsn in each event #56
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In the cases where avoiding re-processing of events is mandatory
the consumer will need to have access to the LSN of the current transaction
For instance using a redis lock with an expire to avoid multiple workers to process the same event
or storing the latest LSN when a transaction is finished processing to know where the consumer shoud resume if it gets restarted (XXX/XXX start location in START_REPLICATION_SLOT)