No type available for cooperative-sticky re-balance

When using **partition.assignment.strategy=cooperative-sticky**, the **KafkaConsumer** type does not expose the following methods:

**incrementalAssign**
**incrementalUnassign**

These methods are required for cooperative rebalancing but are currently missing from the KafkaConsumer type/interface.

As a result, it is not possible to properly implement cooperative-sticky partition assignment using the provided KafkaConsumer API.

Start by locating the KafkaConsumer type/interface referenced in the issue and inspect how its public methods are declared. Confirm the cooperative-sticky requirements, then expose incrementalAssign and incrementalUnassign so users can implement cooperative rebalancing through the provided API.

Written by the indexing model from the issue text.