支持会话粘滞功能

[mayflower-zc]

What is the feature you want to add?
ringhash功能容易造成同一个channel连接数过多。期望有一个支持会话粘滞功能，首次打开session时，使用权限随机分配一个channel。再次打session时分配置到同一个channel。
Why do you want to add this feature?

How to implement this feature?

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