关于自定义jackson 反序列化器

参考了FASTJSON的实现，准备些一个jackson的，发现需要传入 数据类型，不过框架没有传入
看了下代码，其实是可以获取这个类型的，注解里可以通过method对象传入到decoder的接口里，这样就可以实现了
不过这样需要改源码，不知道能否在下一版本提供这个接口呢

Review the annotation and decoder interface described in the issue, focusing on how the method object and data type are currently passed. Define and implement a supported way for custom Jackson deserializers to receive that type, then verify the interface with an appropriate cache deserialization case.

Written by the indexing model from the issue text.