Improve error handling

[NickHeiner]

This improves our error handling to be more structured + consistent. Now, when an AI.JSX run throws an error, we see this in the console:

[11:48:44.165] ERROR (ai-jsx/43657): Rendering element <OpenAIChatModel> failed with exception: AI.JSX(1021): ChatCompletion must have at least child that's a SystemMessage, UserMessage, AssistantMessage, FunctionCall, or FunctionResponse, but no such children were found.

This may be due to a mistake in your code.

Need help?
* Discord: https://discord.com/channels/1065011484125569147/1121125525142904862
* Docs: https://docs.ai-jsx.com/
* GH: https://github.com/fixie-ai/ai-jsx/issues
    exception: {
      "code": 1021,
      "kind": "user",
      "metadata": {}
    }
    renderId: "6c0aebe3-75cd-4048-929b-dfc44f8bd9ca"
    element: "<OpenAIChatModel>"

Key elements:

1. Making it clear whether the error is within the dev's power to fix.
2. CTAs to get help.
3. Programmatically-available metadata on all errors.
4. Statically-known error codes. (Right now, there's no mechanism to prevent people from duplicating codes – if that ends up becoming annoying, we can revisit.)

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Name	Status	Preview	Comments	Updated (UTC)
ai-jsx-docs	❌ Failed (Inspect)			Mar 19, 2024 2:17pm
ai-jsx-nextjs-demo	🔄 Building (Inspect)			Mar 19, 2024 2:17pm
ai-jsx-tutorial-nextjs	🔄 Building (Inspect)			Mar 19, 2024 2:17pm

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[petersalas]

Is it expected that this is thrown exclusively by code that lives in AI.JSX itself?

[petersalas]

I'm skeptical that this is a useful classification in that I suspect it doesn't add material value in places where it's accurate with high confidence (e.g. OpenAI HTTP errors) and is otherwise likely to be inaccurate/confusing.