Option to periodically clear the public.activity_log_event database table

[F1L337]

Is your feature request related to a problem? Please describe.
The database could grow very large over time if there is no retention for the tables.

Describe the solution you'd like
An option to periodically clear the entries based on timestamps (e.g., "Delete all logs older than x days").

Describe alternatives you've considered
Create my own script to be triggered by cron to handle this task.

Additional context
Low priority, but it would be nice to have this feature implemented directly in Defguard.

[teon]

@F1L337 that's a good idea! Adding to backlog for 1.6, thanks! 🫡