feat(add): move module add -> add and add new template-add command

[danielroe]

🔗 Linked issue

resolves #1120

❓ 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 is a backwards compatible change moving nuxt module add to nuxt add (for example nuxt add fonts). It continues to respect template names, so nuxt add middleware myMiddleware will print a deprecation warning but continue to work. And nuxt module add continues to work (as it is documented on many module websites) and I don't envision removing this at any point.

[github-actions]

📦 Bundle Size Comparison

📈 nuxi

Metric	Base	Head	Diff
Rendered	4438.59 KB	4439.68 KB	+1.08 KB (+0.02%)

📈 nuxt-cli

Metric	Base	Head	Diff
Rendered	136.03 KB	137.05 KB	+1.02 KB (+0.75%)

📈 create-nuxt

Metric	Base	Head	Diff
Rendered	2368.87 KB	2368.92 KB	+0.05 KB (+0.00%)

[codspeed-hq]

CodSpeed Performance Report

Merging #1176 will not alter performance

_{Comparing feat/module-add (60ad9eb) with main (1bccf8b)}

Summary

✅ 2 untouched

[pkg-pr-new]

• nuxt-cli-playground

  npm i https://pkg.pr.new/create-nuxt@1176
  

  npm i https://pkg.pr.new/nuxi@1176
  

  npm i https://pkg.pr.new/@nuxt/cli@1176
  

commit: 60ad9eb