docstr: Add a timeout for a send or recv Future
code: def _add_timeout(self, future, timeout):
      """Add a timeout for a send or recv Future"""
  
      def future_timeout():
          if future.done():
              # future already resolved, do nothing
              return
  
          # raise EAGAIN
          future.set_exception(_zmq.Again())
  
      return self._call_later(timeout, future_timeout)
  
imports: import warnings
  from asyncio import Future
  from collections import deque
  from itertools import chain
  from typing import Any, Awaitable, Callable, Dict, List, NamedTuple, Optional, Tuple, Type, TypeVar, Union, cast, overload
  import zmq
  from zmq import EVENTS, POLLIN, POLLOUT
  from zmq._typing import Literal
label_desc: Use image node_id 17 for calling the _AsyncSocket obj's underlying member method code with example usage: obj._add_timeout(future, timeout) and returns: self