input: Write a python function to generate random integer, float, and standard random matrices with numpy.
  assert isinstance(generate_random_matrices(3, 3)['integers'], np.ndarray)
  assert isinstance(generate_random_matrices(3, 3)['floats'], np.ndarray)
  assert isinstance(generate_random_matrices(3, 3)['random'], np.ndarray)
  assert generate_random_matrices(3, 3)['integers'].shape == (3, 3)
  assert generate_random_matrices(3, 3)['floats'].shape == (3, 3)
  assert generate_random_matrices(3, 3)['random'].shape == (3, 3)
output: import numpy as np
  
  def generate_random_matrices(rows, cols):
      matrices = {
          'integers': np.random.randint(0, 100, (rows, cols)),
          'floats': np.random.rand(rows, cols),
          'random': np.random.random((rows, cols))
      }
      return matrices