login limitation by authorized IPs

Why this is necessary**: Allowing users to only access from certain IPs reduces hacks using weak or leaked passwords, increases security and ensures that only that IP or IPs can access the site to view it, with Grafana being used to view important information **What you would like to see added**: A field to be able to enter the IP or range or IPs allowed for each user, or create a submenu where we register the IPs and the organization's users only enter with the allowed IPs **Who is this feature for?** The entire Grafana Labs community