Send and receive kafka headers

[Pastor]

For those issues:

#698
#523

Example:

"headers": [ {"key1": "value1"}, {"key2": "value2"}, {"key1": "value3"} ]

By this #523 (comment)

[ghost]

@confluentinc It looks like @Pastor just signed our Contributor License Agreement. 👍

Always at your service,

clabot

[maximmass]

Would love to see this header support included in a release.

[mihasya]

@rigelbm any plans for getting this PR merged in? This functionality would be very helpful to us at the moment.

[mihasya]

I should add, we are happy to test an RC etc

[Pastor]

I should add, we are happy to test an RC etc

We already use this feature :) in our custom build

[mihasya]

I have been notified that the produce v3 API will add support for headers, and the PR is under active dev #797

[Flooze-IT]

up!

[trnguyencflt]

Hi @Pastor, producer V3 already has support for headers, please let us know whether this PR is still required? Thanks 👍

[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}