Martyn Ye

Description... 1. remove lingeringOnCommitWouldBeBeneficial since it is not used and make the logic more complex 2. remove unused imports ### Checklist - [ ] Documentation (if applicable) - [x] Changelog

make committed offset accurate when partition assigned to avoid offset reset

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Description... make offsetHighestSucceeded accurate when partition assigned We have encountered offset reset issue while frequent partition rebalancing. The root cause is caused by : (1) the `offsetHighestSucceeded` is assigned w/...

How this happens: 1. traffic is low / unbalanced 2. no new offset in this partition 3. frequent rebalancing