feat: static interval between messages

[mredlars]

Problem

Connector can only produce in random intervals.

Solution

Add a configuration option that will overide default, random interval between messages with a static one.

Does this solution apply anywhere else?

• [ ] yes
• [X] no

If yes, where?

Test Strategy

Testing done:

• [ ] Unit tests
• [ ] Integration tests
• [ ] System tests
• [X] Manual tests

Release Plan

[cla-assistant[bot]]

All committers have signed the CLA.