WIP: Add support for kafka producer config linger.ms in kafka sink

[punit-kulal]

linger.ms defines the maximum interval for buffering messages in the client before being produced to kafka. This improves efficiency of the producer and also greatly reduces the load on kafka.

The interval and buffering also ensures better compression when enabled.

More Reading: https://github.com/confluentinc/librdkafka/blob/master/INTRODUCTION.md#performance

Open Questions:

• Other configuration related to kafka sink are similar to flags, would you want this configuration be also similar to switch where the recommended config(1000) is behind a flag and in the code or should it be similar to the min_commit interval config we have for firehose.

Todo:

• Add documentation for the config exposed[Waitiing on finalisation for config exposure pattern]
• Update version