feat(pty): add initial pty node

addons/godot_xterm/native/src/pty_unix.h

@@ -0,0 +1,33 @@
+// SPDX-FileCopyrightText: 2024 Leroy Hopson <godot-xterm@leroy.nix.nz>
+// SPDX-License-Identifier: MIT
+
+#pragma once
+
+#include <godot_cpp/variant/callable.hpp>
+#include <godot_cpp/variant/dictionary.hpp>
+
+namespace godot
+{
+  class PTYUnix
+  {
+  public:
+    static Dictionary fork(
+      const String &p_file,
+      const PackedStringArray &p_args,
+      const PackedStringArray &p_env,
+      const String &p_cwd,
+      const int &p_cols,
+      const int &p_rows,
+      const int &p_uid,
+      const int &p_gid,
+      const bool &p_utf8,
+      const String &p_helper_path,
+      const Callable &p_on_exit
+    );
+
+    static Dictionary open(
+      const int &p_cols,
+      const int &p_rows
+    );
+  };
+} // namespace godot