chore: add custom system prompt capability to judge

[GangGreenTemperTatum]

[HOOKS] add custom system prompt capability to judge

Key Changes:

• adds custom system_prompt capability to the dn judge hook

currently, the system prompt isn't configurable in the judge hook which is difficult to mould into a fit for multiple types of agent use-cases - this aims to add some flexibility from a user perspective without having to rewrite the judge agent from scratch as a custom implementation

Changed:

• adds custom system_prompt capability to the dn judge hook

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Generated Summary:

• Added an optional system_prompt parameter to the llm_judge function to allow for custom system prompts.
• Updated the logic in llm_judge to use the system_prompt if provided, enhancing flexibility and usability.
• If system_prompt is not specified, the function defaults to existing behavior, ensuring backward compatibility.
• This change could improve the evaluation process by tailoring prompts to specific contexts or requirements.

This summary was generated with ❤️ by rigging