tiltwind(斜风)

**What happened**: In the previous implementation, dubbo-go-hessian2 would encode nil values of a specified type as empty bytes. For example: ```go var null *int = nil e := NewEncoder() e.Encode(null)...

Support java wrapper types

3

**What would you like to be added**: Support java wrapper types. **Why is this needed**: Many users need types in golang which maps the java wrapper types , including Interger,Long,Short,Float,Double,Character....

# 背景 目前账单内容都是从源文件解析后，直接生成html报表。 # 需求 将账单内容存储到sqlite中，可以更好的进行去重过滤等，也可以为未来交互是账单做好数据基础。