nu: Add sudo toggling key

Toggle sudo prefix for command line with <alt-s>. Not sure if I will
keep this binding in the long run but it is a good example of command
execution using nushell through a key binding.

From: https://github.com/nushell/nushell/discussions/16043

terminal/.config/nushell/config.nu

@@ -70,6 +70,16 @@ $env.config.keybindings = [
             send: OpenEditor
         }
     }
+    {
+        name: toggle_sudo
+        modifier: alt
+        keycode: char_s
+        mode: [emacs vi_insert vi_normal]
+        event: {
+            send: executehostcommand
+            cmd: "let cmd = (commandline); commandline edit (if $cmd starts-with sudo { $cmd | str replace -r '^sudo ' '' } else { 'sudo ' ++ $cmd });"
+        }
+    }
     {
         name: run_zoxide
         modifier: alt