Port XDP dialogs to use workspace components

This is not just about porting to QtQuick per se, but the dialogs @devinlin put together: https://invent.kde.org/plasma/plasma-workspace/-/tree/master/components/dialogs

So far it uses the most desktopy one because it's the one easier to port 1:1.

• Access
• UserInfo
• ScreenChooser
• AppChooser
• FileChooser
• Screenshoot
• RemoteDesktop