Implement an AsyncBatcher for Apache Kafka

[hussein-awala]

Producing Kafka messages in batches helps optimize network utilization and improve overall throughput.

aiokafka is the most used package to interact with Kafka asynchronously from Python, this package doesn't support an implicit batching mechanism. Instead, the user can create the batches explicitly and send them to Kafka.

Here is an example of how to produce messages in batches using aiokafka, which would be great to support in our package.