nodejs: add a stack for Kafka

[ianpartridge]

Is your feature request related to a problem? Please describe.

Currently the nodejs-express stacks provides 2 templates: simple and scaffold.

We would like to add support for event-driven applications using Kafka. This should help users quickly get started with building Kafka-enabled applications, and show how to do consume/produce on Kafka topics.

This could be delivered as an additional template, or a new stack.

Additional context

Assess these libraries:
https://github.com/SOHU-Co/kafka-node
https://github.com/tulios/kafkajs
https://github.com/Blizzard/node-rdkafka

[ianpartridge]

^^^ @sam-github :)

[ianpartridge]

I spoke to @sam-github about this. As Express is focussed on HTTP routing it probably wouldn't make sense to have a Kafka template in that stack.

The best thing may be a new nodejs-kafka stack, we would need to decide which NPM package to use for the Kafka connector (thish would need an API assessment).