Support for KDE and GNOME unstable repositories

[loxoron218]

describe the request

I think it would be cool if archinstall included the option to enable the unstable repositories for KDE and GNOME, similar to how it currently supports the multilib and testing repositories.

This feature would make it easier to opt into the latest versions of KDE and GNOME without having to manually configure their pacman configuration files post-installation. Especially for those users that really like to have a bleeding edge distribution like I assume most Arch users are.

I always add them with this code to respect the original format of pacman.conf:

sudo sh -c 'echo "" >> /etc/pacman.conf'
sudo sh -c 'echo "[gnome-unstable]" >> /etc/pacman.conf'
sudo sh -c 'echo "Include = /etc/pacman.d/mirrorlist" >> /etc/pacman.conf'
sudo sh -c 'echo "" >> /etc/pacman.conf'
sudo sh -c 'echo "[kde-unstable]" >> /etc/pacman.conf'
sudo sh -c 'echo "Include = /etc/pacman.d/mirrorlist" >> /etc/pacman.conf'