Support Kafka's ProducerConfig.REQUEST_TIMEOUT_MS_CONFIG. (#3797)
**Motivation**
Support Kafka's ProducerConfig.REQUEST_TIMEOUT_MS_CONFIG #1090
Previously `ProducerBuilder.sendTimeout` was set by parsing Kafka's `ProducerConfig.MAX_BLOCK_MS_CONFIG`.
According to Kafka's [document](https://kafka.apache.org/20/documentation.html) it's for
> Controlling how long KafkaProducer.send() and KafkaProducer.partitionsFor() will block either because the buffer is full or metadata unavailable.
But `ProducerBuilder.sendTimeout` is for
> If a message is not acknowledged by the server before the sendTimeout expires, an error will be reported.
And Kafka's `ProducerConfig.REQUEST_TIMEOUT_MS_CONFIG`, according to the document is for:
> Controlling the maximum amount of time the client will wait for the response of a request.
Which I think would be better fit purpose of Pulsar's `ProducerBuilder.sendTimeout`.
2 files changed
