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Comment: Add a note about the general problem this caused us to notice.

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After some code analysis, we determined that there wasn't an existing API that a Connector could use to determine that the task was about to be shut down for a rebalance. After some thought we decided that this was a problem more generally about giving connectors the information about the state of the world outside the connector such that they could make intelligent decisions about how to behave in preCommit. Giving this information to a connector gives developers writing connectors options to change their behavior if a rebalance or shutdown is pending.

To achieve this we We would like to add such an API so that the preCommit hook of a Connector can decide if it should behave differently because the task is actively trying to shut down.

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