Provide a way to unsubscribe from LogHandler/ErrorHandler

[horato]

Description

There is currently no way to remove the referenced Actions from Producer/Consumer which might cause a memory leak.

var producer = new ProducerBuilder<string, string>(producerConfig)
        .SetLogHandler(LogHandler)
        .Build();

How to reproduce

Confluent.Kafka 2.3.0 librdkafka 2.3.0

Checklist

Please provide the following information:

• [ ] A complete (i.e. we can run it), minimal program demonstrating the problem. No need to supply a project file.
• [x] Confluent.Kafka nuget version.
• [x] Apache Kafka version.
• [ ] Client configuration.
• [ ] Operating system.
• [ ] Provide logs (with "debug" : "..." as necessary in configuration).
• [ ] Provide broker log excerpts.
• [ ] Critical issue.

[quixoticaxis]

What is the scenario for memory leaking? When you're done with the producer, the handlers would go with it.

[anchitj]

Can you provide more details?

[horato]

I am not sure what more details you want me to provide. I need a way to unsubscribe/unset reference to error/log handlers actions as described in the issue's title and description. Namely

ProducerBuilder<,>.ErrorHandler
ProducerBuilder<,>.LogHandler
Producer<,>.errorHandler
Producer<,>.logHandler