Add event to modify categories during destination data one import #34
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A new PSR-14 event is added that allows to modify the categories to be assigned to an event.
The event itself (including already existing categories) as well as the list of categories to be used after import are available. It is possible to change the categories to be assigned, e.g. keep some of the existing categories.
That way it is possible for installations to add custom categories to events.
Relates: #10623