[Dy2St] Use hand write unparse instead of astor in Python3.8 #61540
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Description
修复 #61480 在 Python 3.8 环境下没有 astor 导致挂掉的问题,手写一个简单的 unparse 替代 astor(因为我们的使用场景有限,手写的基本可以满足,全量动转静单测测试也是通过的)
PR-CI-APPROVAL 环境里随机 Python 3.8 和 Python 3.9 就离谱
PCard-66972