Consumer: Implement graceful closure #38
Description
Is your feature request related to a problem? Please describe.
The consumer needs to implement a unsettled_message_count in order to allow a graceful shutdown.
Example from Java:
// pause the delivery of messages
consumer.pause();
// ensure the number of unsettled messages reaches 0
long unsettledMessageCount = consumer.unsettledMessageCount();
// close the consumer
consumer.close();
Describe the solution you'd like
Graceful closure to be implemented
Describe alternatives you've considered
No response
Additional context
No response