Add date_recur Feeds Target

This will either need to be its own project or add appropriate test coverage. Will need to be former if no test coverage as I have no intention to manually test.

#16 Patch Failed to Apply
So i add some correction, but it's doesn't work correct (for me)

Recurring dates field settings

Feeds mapping

Values in source

DTSTART:20240804T180000
DTEND:20240804T210000
RRULE:FREQ=WEEKLY;UNTIL=20241006T210000Z;INTERVAL=1;WKST=MO;BYDAY=SA,SU

But after import in result UNTIL value come to Start date and End date.

Why it's happened?

Per #17

Someone with sufficient motivation should move this to its own project.