Add a SwipeDelegate

Marco Martinrequested to merge
work/maert/SwipeDelegate into master

Adds the missing SwipeDelegate component, so that it can have the standard ItemDelegate background, units and so on. This is used by Kirigami SwipeListItem which used to have wrong backgrounds especially visible in dark mode

Also, all components should be implemented here, no matter what

BUG:495291 FIXED-IN: 6.9

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