[Processor] Add a control message to inform the processor that draining is done #3153
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At present, we lack a signaling mechanism to notify the processor when draining is complete. Currently, the processor relies on a timeout, which is not the most efficient approach. Even if draining takes less than a second, we still wait for around 10 seconds.
To address this issue, we are introducing a new control message -
DrainDoneMessageKind
. This message allows the wrapper to inform the processor when draining is done.Jira - https://jira.iguazeng.com/browse/NUC-124