KBF-Core：
-
Optimize the code structure of the reducer to support "predicate" operation.
优化Reduce策略的代码结构，支持predicate操作 -
When executing multiple extension point instances, combine the "predicate" operation of the reducer to resolve the value retrieval issues of the "first" reduce type strategy.
多个扩展点实例执行时，结合reducer的predicate操作，修复first策略的取值问题
Others：
- Add unit tests for the reducer handle.
添加单元测试