feat: composables import path

[ineshbose]

🔗 Linked issue

nuxt/nuxt#12414

❓ 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 like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Added 'composables/*/index.{ts,js,mjs,mts}' to composable imports to scan the same way as plugins/

📝 Checklist

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

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[danielroe]

Here's some context: #6025.

[ineshbose]

Thanks for linking the previous discussion(s). I see nuxt/nuxt#14358 open as well in that regard, so the planned approach instead is for plugins/ to only scan top level. Up to you to close this!

Edit: #10090 for plugins/