Add support for InputCapture portal and RemoteDesktop ConnectToEIS

InputCapture portal spec has been finalized and merged in xdg-desktop-portal https://github.com/flatpak/xdg-desktop-portal/pull/714

It has also been implemented and merged into xdg-desktop-portal-gnome https://gitlab.gnome.org/GNOME/xdg-desktop-portal-gnome/-/merge_requests/61

This isssue is a request that it be implemented in xdg-desktop-portal-kde