Use dspy to improve the prompt

[snakedye]

DSPy is a framework for algorithmically optimizing LM prompts and weights.

I should produce more optimize prompts and give us more reliable and accurate results.

Tasks:

• Use dspy in the gpt wrapper.
• Adapt the prompt file to be compatible with what's asked by dspy.
• Run e2e tests with dspy.

Acceptance Criteria:

• All the tests should pass.
• It should not have an impact on the API.
• The prompt needs to return a valid JSON.