[COMMON] refine Broker structure to avoid duplicate large collection #1792
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Broker 裡面有多個資料結構描述
TopicPartition
,這會讓大型叢集在操作時要創建好幾個大型集合才能形成Broker
這個結構,此外 orphan 是一個很抽象的概念,實際上不常發生所以也移除