feat: display user joined date in event dashboard

[gikf]

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• Display event_user _joineddate in event dashboard.
• Order of the joining can be important for the waitlist processing order.
• Displaying it is intended for the event administrator processing invites, or moving from (overcrowded) attendees back to waitlist.
• It's a bit stretch to be using _joineddate with the current name for this purpose. But that's the only existing field that could be used right now.
  • _createdat - doesn't change, no matter how many times user will cancel their attendance.
  • _updatedat - is changed event if user changes just subscription status.
  • _joineddate - initially starts the same as _createdat. PR adds updating it every time user attends keeping the track of the last time. So ie. attend at Monday -> cancel at Friday -> attend again at Sunday. Won't push user in the line before those wanting to attend between Monday and Sunday.
• Any particular date format requests?

[ghost]

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[gikf]

From the resolver - not really. For all formatting we can use format or formatRelative from date-fns. For the former one question is what options use. I'd imagine date (day, month, year) and time (hour, minutes) would be included.