Add number of workers to scale up REST API

[r0x0d]

This patch introduces the ability to increase the number of workers for the REST API via its configuration file.

Description

Type of change

• Refactor
• New feature
• Bug fix
• CVE fix
• Optimization
• Documentation Update
• Configuration Update
• Bump-up dependent library
• Bump-up library or tool used for development (does not change the final image)
• CI configuration change
• Konflux configuration change

Related Tickets & Documents

• Related Issue #
• Closes [RFE] Ability to specify number of workers to allow REST API to be scaled up #51

Checklist before requesting a review

• I have performed a self-review of my code.
• PR has passed all pre-merge test jobs.
• If it is a core feature, I have added thorough tests.

Testing

• Please provide detailed steps to perform tests related to this code change.
• How were the fix/results from this change verified? Please provide relevant screenshots or results.

[r0x0d]

@tisnik probably this still needs some stuff to be finished. I was not sure where the documentation should go, so I found a config.puml in the docs folder. Let me know if there is more to be done here and where I should go to finish the task.

[tisnik]

it looks ok, I'd just suggest to remove the "optionality" of this attribute (if pydantic allow it)

[tisnik]

it looks good!