* Adds pruner for eventstore - default 24 hours. Adds tests.
* update comment
* remove delay on startup. formatting
* updates log message type and removes useless comment
* caller handles goroutine for runCleanupOldEvents()
* simplify timestamp extraction
* adds config for event pruning interval
* uses start and end key to get all expired events
* remove sort when listing keys in event pruner - order doesnt matter
* use snowflake constants
* log when we delete 0 rows
* pass time.Time to cleanup old events func
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