shell: nushell integration scripts (#4630)

Co-authored-by: imsys <911254+imsys@users.noreply.github.com>
Co-authored-by: Grzegorz Zalewski (Greg) <12560152+zalewskigrzegorz@users.noreply.github.com>
Co-authored-by: René Jochum <rene@jochum.dev>
Co-authored-by: Junegunn Choi <junegunn.c@gmail.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

main.go

@@ -29,6 +29,12 @@ var zshCompletion []byte
 //go:embed shell/key-bindings.fish
 var fishKeyBindings []byte
 
+//go:embed shell/key-bindings.nu
+var nushellKeyBindings []byte
+
+//go:embed shell/completion.nu
+var nushellCompletion []byte
+
 //go:embed shell/completion.fish
 var fishCompletion []byte
 
@@ -71,6 +77,11 @@ func main() {
 		printScript("completion.fish", fishCompletion)
 		return
 	}
+	if options.Nushell {
+		printScript("key-bindings.nu", nushellKeyBindings)
+		printScript("completion.nu", nushellCompletion)
+		return
+	}
 	if options.Help {
 		fmt.Print(fzf.Usage)
 		return