class_docstr: Print a cudf::device_span
code: def to_string(self):
      return f"{self.val.type} of length {self.size} at {hex(self.pointer)}"
  
file_path: cudf/cpp/scripts/gdb-pretty-printers.py
imports: import gdb
label_desc: Use image node_id 3 for calling the CudfDeviceSpanPrinter obj's underlying member method code with example usage: obj.to_string() and returns: self, str, self, str, hex