Add itertools.batched() #98363

  def batched(iterable, n):
      "Batch data into lists of length n. The last batch may be shorter."
      # batched('ABCDEFG', 3) --> ABC DEF G
      if n < 1:
          raise ValueError('n must be >= 1')
      it = iter(iterable)
      while (batch := list(islice(it, n))):
          yield batch