[Dy2st]Integrated gast library to fix compatibility problem permanently#34556

Merged

Aurelius84 merged 7 commits intoPaddlePaddle:developfrom 0x45f:gast

Aug 5, 2021

+1,186-31

Commits on Aug 2, 2021

integrated gast library
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integrated gast library
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fix unittest and remove ast2.py
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Commits on Aug 3, 2021

remove 'gast' from __all__ in __init__.py
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Commits on Aug 4, 2021

add copyright in other files
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fix copyright
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Commits on Aug 5, 2021

Merge remote-tracking branch 'upstream/develop' into gast
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