feat: teach vscode/fiddle to explain when we drop information

[sxlijin]

when there's an explanation to be shown, the information icon is clickable and toggles showing the explanation:

if there's no explanation, the information icon tooltip just shows "parsing succeeded" and clicking it does nothing

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Name	Status	Preview	Comments	Updated (UTC)
baml	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 21, 2024 2:58am

[hellovai]

Looks interesting! Let's chat before merge to discuss edge cases!

[sxlijin]

use this file to repro it on promptfiddle (and swap out for openai/gpt-4o-mini for no errors)

// This is a BAML config file, which extends the Jinja2 templating language to write LLM functions.

class Recipe {
  name string
  ingredients Ingredient[]
}
enum IngredientUnit {
  Tbsp
  Lbs
  Grams
  }

class Ingredient {
  name string
  amount int | float
  unit IngredientUnit
}

function ExtractRecipe(subject: string) -> Recipe {
  // see clients.baml
  client "openai/gpt-3.5-turbo"

  // The prompt uses Jinja syntax. Change the models or this text and watch the prompt preview change!
  prompt #"
        {# special macro to print the output instructions. #}
    {{ ctx.output_format }}

    
    Give me a recipe for {{ subject }}
  "#
}

test Test1 {
  functions [ExtractRecipe]
  args {
    subject "beef stew"
  }
}