Update Kafka docs with encoder info

[charlesjmorgan]

add docs for Kafka inserts and raw, avro, json, and csv encoders

[losipiuk]

Thanks! This looks nice. It matches the quality of decoder documentation. I am not entirely sure if the structure is what we want in the long-term, but IMO this is great for now.

@mosabua do you wan to take a look?

[mosabua]

We need to explain how to use this more in detail and what you achieve by doing this. Specifically this enables INSERT query support (writing data) ..

[mosabua]

Adding WIP label since @charlesjmorgan is adding JSON info and then I will do another review... ping me when its ready for that Charles

[charlesjmorgan]

added JSON encoder documentation

[mosabua]

Looks good now. Great work.

[charlesjmorgan]

@electrum this is ready to be merged 🚀

[charlesjmorgan]

@electrum thanks for all the feedback!

[electrum]

Thanks!

[mosabua]

Congrats @charlesjmorgan !