376 azure event hubs

[mmacai]

Description

Closes #376

• updated Kafka SSL certificates config to be able to set only specific certs - this enables usage of Azure Event Hubs

What to look out for

Check documentation.

Process

The goal is to improve not only the code in this PR but also our skills! The "rules":

• The review is considered "done" as soon as all reviewers have added their review, and all their comments have been addressed.
• For knowledge-sharing reviews, each reviewer should "approve" the PR after studying its content.
• After the approval, the merge is concluded by the developer.

Have fun!

[mmacai]

@patrickmedina turns out it needs a quite specific configuration and small tweak on our side, can you give it a shot? Provided example env vars in the docs.