Created by: abhinavarora

Fix https://github.com/PaddlePaddle/Paddle/issues/8445 Fix https://github.com/PaddlePaddle/Paddle/issues/8446

@kavyasrinet and I have been pair programming to move DataType enum inside VarType as proposed @wangkuiyi in https://github.com/PaddlePaddle/Paddle/pull/8352