Created by: liym27

PR types: New features

PR changes: dygraph to static graph

Describe:

1. Fix bug: Create logic node recursively in LogicalOpTransformer.

2. Add functions convert_XX to run the transformed code dynamically. Which means,

• All while stmts and logical stmts are transformed whether it depends on Tensor or not;
• But in run-time, the code will be run in different ways (1) run paddle op like while_loop; (2) run python while. How it runs depends on whether it depends on Tensor.

This method will not use static variable types while transforming ast node, because the variable types got from static analysis are often inaccurate.

convert_while_loop : A function representation of a Python while statement. convert_logical_and : A function representation of a Python and statement. convert_logical_or : A function representation of a Python or statement. convert_logical_not : A function representation of a Python not statement.

Related PR : convert_ifelse: https://github.com/PaddlePaddle/Paddle/pull/24866