feat: support all features of produce in node-rdkafka

[adtennant]

The most important part is making partition optional, as it should be. I've also added support for headers etc too.

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[Uzlopak]

Can you add atleast some typings tests?

[adtennant]

@Uzlopak I don’t see any similar tests in the repo - do you have an example of what you’re expecting?