Process escape character sequences properly in config KDL

[samholmes]

I have this in my config:

    normal clear-defaults=true {
        bind "\u0000" { SwitchToMode "tab"; }
    }

I'm trying to bind the "\x00" character to switch to "tab" mode. But when running Zellij I get:

  × Failed to parse Zellij configuration
   ╭─[/Users/samholmes/.config/zellij/config.kdl:2:1]
 2 │     normal clear-defaults=true {
 3 │         bind "\u0000" { SwitchToMode "tab"; }
   ·                ▲
   ·                ╰── Kdl Deserialization Error
 4 │     }
   ╰────
  help: For more information, please see our configuration guide: https://zellij.dev/documentation/
        configuration.html

I'm running Zellij 0.40.1.

My old YAML file contained:

keybinds:
  normal:
    - unbind: true
    # Switch Modes (only one switch)
    - action: [SwitchToMode: Tab]
      key: [Char: "\x00"]
    # - action: [SwitchToMode: Locked]
    #   key: [Esc]

Which can compile to KDL, but it causes my KDL file to contain the character "�" in my file (which is the escaped character), which causes my KDL file to be mis-interpretted as a binary file instead of a text file.

The fix for this would mean that whatever KDL parser that Zellij is using must respect escape sequences like "\x00" or "\u0000".