notification: Add categories from notification portal v2
The xdg-desktop-portal added categories to the portal implementation but those weren't synced with the xdg spec leading to some variances¹ for already existing categories and new ones were added. Although these are not ideal (e.g. the CBS related ones are very U.S. centric) let's add the new categories so app developers don't need to jump through hoops for such simple things as sending out a notification.
Marking as draft as this only makes sense when the portal MR lands. If not we can adjust the categories and e.g. drop some of them as they're only useful for OS components.