Is your feature request related to a problem? Please describe.
可以延期通过好友，可以存储好友请求

Describe the solution you'd like
在friendship中增加getPayload()方法，来获取好友请求的详细数据
在friendship中增加build()方法，通过payload数据来补充friendship数据

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[enhancement]