feat(types): support custom values from app.config.ts

[benjamincanac]

🔗 Linked issue

Resolves #858

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This PR enables props autocomplete with custom values added in app.config.ts, only default values worked previously.

For example if we define an app.config.ts as such:

export default defineAppConfig({
  ui: {
    button: {
      color: {
        custom: {
          subtle: '...'
        }
      }
    }
  }
})

Autocomplete will for for the color and variant props of the Button:

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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Name	Status	Preview	Updated (UTC)
ui	✅ Ready (Inspect)	Visit Preview	Nov 17, 2023 5:39pm

[benjamincanac]

Reverted a commit to open this draft PR as it broke nuxt-component-meta, so the selects for size, color and variant didn't work anymore. Also, this doesn't work when the user's AppConfig is not filled.