remote-desktop: add the ability to communicate via an EIS socket
RemoteDesktop portal spec was updated to include ConnectToEIS
https://github.com/flatpak/xdg-desktop-portal/pull/762
It has also been implemented and merged into xdg-desktop-portal-gnome https://gitlab.gnome.org/GNOME/xdg-desktop-portal-gnome/-/merge_requests/97
This isssue is a request that it be implemented in xdg-desktop-portal-kde