Accept bindings to key functions bigger than F12

[GCBallesteros]

As it currently stands any attempt to bind a function key with number bigger than 12 results in the following error message:

  × Failed to parse Zellij configuration
   ╭─[/home/guillem/.config/zellij/config.kdl:4:1]
 5 │         bind "F13" {GoToNextTab;}
   ·         ────────────┬────────────
   ·                     ╰── Invalid key: 'F13'
 6 │     }
   ╰────

I have a programmable keyboard that can go up to F24. I usually use these for triggering program specific functionality. Would it be feasible to allow function keys beyond F12?