sendDurableExecutionCallbackHeartbeat
inline suspend fun LambdaClient.sendDurableExecutionCallbackHeartbeat(crossinline block: SendDurableExecutionCallbackHeartbeatRequest.Builder.() -> Unit): SendDurableExecutionCallbackHeartbeatResponse
Sends a heartbeat signal for a long-running callback operation to prevent timeout. Use this API to extend the callback timeout period while the external operation is still in progress.