Created by: chenwhql

PR types

New features

PR changes

APIs

Describe

【兼容升级】This PR supprot loading state_dict from save_inference_model save result.

This is an important feature, and we often see related problems in issues. After we switched from static graph mode to dynamic graph mode, many users rewritten the dynamic graph model code and needed to load from the result of save_inferenece_model in original static graph model, such as: https://github.com/PaddlePaddle/Paddle/issues/26519

API changes:

• paddle.load(model_path, keep_name_table=False) -> paddle.load(model_path, configs=None): add decorator deprecate_keep_name_table for compatibility
• paddle.jit.SaveLoadConfig -> paddle.SaveLoadConfig: because paddle.load also use it, move it to paddle module, SaveLoadConfig is a class for two save format's compatibility, not only a jit related class
• add paddle.SaveLoadConfig.keep_name_table: for compatible with old paddle.load(model_path, keep_name_table=False)

After this PR, the Paddle 2.0 Save/Load inferfaces are like follow:

This PR creates the green line in graph.

Doc change

related PR: https://github.com/PaddlePaddle/FluidDoc/pull/2531