ZeroMQ can be included in the backend roadmap

[sbashett]

What roadmap is this issue about?

• [ ] Frontend Roadmap
• [x] Backend Roadmap
• [ ] DevOps Roadmap
• [ ] All Roadmaps

What is this issue about?

• [ ] Discussion for a pull request I would want to open.
• [x] Addition of a new item
• [ ] Removal of some existing item
• [ ] Changing in arrangement
• [ ] General suggestion
• [ ] Sharing an Idea
• [ ] Something else

Please acknowledge the below listed

• [x] This is not a duplicate issue. I have searched and there is no existing issue for this.
• [x] I understand that these roadmaps are highly opinionated. The purpose is to not to include everything out there in these roadmaps but to have everything that is most relevant today comparing to the other options listed.
• [x] I have read the contribution docs before opening this issue.

Enter the details about the issue here

Suggesting ZeroMQ to be added as an asynchronus message passing protocol in the backend roadmap.