Feature Request: Each zrpc client can set zrpc ClientSlowThreshold individually

[taobig]

Now we can only call zrpc.SetClientSlowThreshold(threshold time.Duration) to set zrpc's "client slow threshold value". But it works on all RPC clients. I hope each zrpc client can set zrpc ClientSlowThreshold individually.

[github-actions[bot]]

This issue is stale because it has been open for 30 days with no activity.

[github-actions[bot]]

This issue was closed because it has been inactive for 14 days since being marked as stale.