[KAFKA-8703] Move PartitionAssignor to public API - ASF JIRA

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Details

Type: Sub-task
Status: Resolved
Priority: Major
Resolution: Fixed
Affects Version/s: None
Fix Version/s: None
Component/s: clients, streams
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Description

Currently the PartitionAssignor, which is meant to be a pluggable interface, sits in the internal package. It should be part of the public API, so we are deprecating the old consumer.internal.PartitionAssignor in favor of a new consumer.ConsumerPartitionAssignor.

We also want to take the opportunity to refactor the interface a bit, so as to achieve an easier to evolve API moving forward

Due to the way assignors are instantiated, moving to a new ConsumerPartitionAssignor interface will be fully compatible for most users except those who have implemented the internal.PartitionAssignor (see ~~KAFKA-8704~~)