refer to: https://www.baeldung.com/java-annotation-processing-builder

# 1 主要演示效果
在编译期，将

annotation-user/target/classes/com/roadl/annouser/Person.class

setter上的注解生成辅助类：

annotation-user/target/classes/com/roadl/annouser/PersonBuilder.class

# 2 module化
annotation_processing 父project 

annotation_processing/annotation-user 子module A，依赖module B

annotation_processing/annotation-processor 子module B