input: Write a python function to create a 2-dimensional numpy array filled with zeros of given shape.
  assert np.array_equal(create_zeros_array(3, 3), np.array([[0, 0, 0], [0, 0, 0], [0, 0, 0]]))
  assert np.array_equal(create_zeros_array(2, 4), np.array([[0, 0, 0, 0], [0, 0, 0, 0]]))
  assert np.array_equal(create_zeros_array(1, 5), np.array([[0, 0, 0, 0, 0]]))
output: import numpy as np
  
  def create_zeros_array(rows, cols):
      return np.zeros((rows, cols))