* Copy QAT files from PaddleSlim

* Integrate QAT API into Paddle

* Replace eval function

* Reduce test_quant_aware run time

* Apply new formatter on modified files

* Remove code check for Paddle version check

* Copy quant_post_quant_aware UT from PaddleSlim

* Integrate test_quant_post_quant_aware UT into PaddlePaddle

* Apply new formatter on modified files

* Remove redundant code and add unittests

* Add new unittests

* Update the time limit of new unittests