??????[Discuss][PIP-164] Support split bundle by flow or qps

[lordcheng10]

1. Similar problems also exist in topic_count_equally_divide. In some 
scenarios, topics are also temporary, because they will be created and 
destroyed continuously.
2. The traffic and qps of most scenarios are relatively stable. For scenarios 
where traffic and qps change greatly and frequently, it cannot be solved very 
well.
3. Maybe we should recommend using this algorithm in scenarios where traffic or 
QPS is stable