[ Dy2Static | Controlflow ]While + Cond support for python container.

[2742195759]

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Others

PR changes

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Describe

While support for python container. It is convenient to convert more dynamic graph codes into static graphs.

support the following case:

for i in tensor:
    a = {'a': 1, 'b': 2, 'c': 3}

and

  a = {"a": 3, "b": 4, "c": 9}                                                                                                                                                                                    
  for i in x:                                                                                           
      a = a  # make the a become loop vars. a will be convert into {'a', Tensor, 'b': Tensor, 'c': Tensor}                                                                            
      a['a'] = 12   

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[Aurelius84]

LGTM