feat(nuxi): add support for custom templates for scaffolding.

[lazaroofarrill]

🔗 Issue nuxt/nuxt.js#13552

❓ 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

Aims to make the cli scaffolding more useful but allowing custom definitions.
Adds the possibility of extending nuxi add command with new templates.

npx nuxi add template custom-template creates the file templates/custom-template.mjs containing a skeleton for a template definition.

Custom templates with the same name of default templates will take precedence.

Part of roadmap in nuxt/nuxt.js#13552 .

📝 Checklist

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

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[pi0]

Thanks for the PR @lazaroofarrill but I think we need to follow roadmap and create templating utils first. Adding feature like this makes testing and maintenance hard for us.

I will initiate it right after RC. Contribution more than welcome into it 💚