I want to write a software design document for a new product `Chateval`, which can make it easier to evaluate generative AI systems (e.g., chatgpt and claude). Chateval can (1) provide many evaluation scenarios, from text writing to code and math, and (2) support many evaluation metrics, e.g. helpfulness, relevance and factuality. It not only provides developers with optimization directions, but also helps users use generative ai products such as chatgpt more reliably. Please help me finish the document that follows the structure:  [Overview],  [Goals], [Use Cases], [API Design], [Milestones], [Open Questions], [People].
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Overview:
Chateval is a software platform designed to facilitate the evaluation of generative AI systems, making it easier for developers and users to understand the strengths and limitations of these systems. Chateval provides a diverse range of evaluation scenarios, from simple text generation to complex code and mathematical problems, ensuring that users can test AI systems under a variety of conditions. Moreover, Chateval supports a wide range of evaluation metrics, enabling users to measure the performance of AI systems based on criteria they deem important, such as helpfulness, relevance, and factuality.

Goals:
The primary goals