expose groupfolder through dav endpoint

[icewind1991]

expose groupfolders at /remote.php/dav/groupfolders/<user id>

you can also request the mount point for the group folder by requesting the {http://nextcloud.org/ns}mount-point property

• feat(files): add default action support and expose router server#37824

[skjnldsv]

Ready for my part 👍

[skjnldsv]

@artonge @icewind1991 if you have some time to quickly test the front, would be nice! :)

[artonge]

• If no actions available, should we allow selection?
• Is there a way to provide icons to be displayed on the folder or file icon to differentiate groupfolder, share, e2ee, ...
• The home icon is useless, can it be removed?

[skjnldsv]

• If no actions available, should we allow selection?

For server

• Is there a way to provide icons to be displayed on the folder or file icon to differentiate groupfolder, share, e2ee, ...

Will be, also for server. The old way was a bit hacky, I will provide a dedicated MimeIcon API to register inline svg
EDIT: seems the current way is different than the mime API already in place. I will see what I can come up with :)

• The home icon is useless, can it be removed?

It's not, clicking the last breadcrumb refreshes the current folder.
Here it would refresh the list of groupfolders (as in legacy files)
Nonetheless, this would be an issue for server and in the future, there is no doubt the groupfolder will not be just a redirect anymore but fully browsable. Let's keep it like that :)