Add evaluation to the exam generation process

[mateuseap]

According to our architecture diagram, our system requires not only generating exams but also evaluating and refining the generated content. To achieve this, we need to explore suitable options and integrate them into our backend. The research conducted in issue #12 can provide valuable insights for this implementation.

Next Steps

1. Review the findings from issue #12 regarding alternative OpenAI API methods.
2. Investigate and select appropriate methods for evaluating and refining exam content.
3. Rewrite our architecture diagram.
4. Implement the chosen evaluation process within our backend system.
5. Integrate the evaluation step into the exam generation workflow to ensure seamless functionality.