feat: experimental composition api via useEvent() ans async context support

[pi0]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 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)
• 🧹 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 a new experiment using unctx native local storage support to enable a new development pattern similar to vue composition API to make server events available in every async context using useEvent() without need to passing it directly around.

Before:

// routes/index.ts
export default defineEventHandler(async (event) => {
  const user = await useAuth(event)
})

// utils/auth.ts
export function useAuth(event) {
  return useSession(event)
}

After:

// routes/index.ts
export default defineEventHandler(async () => {
  const user = await useAuth()
})

// utils/auth.ts
export function useAuth() {
  return useSession()
}

Note: This feature is currently supported for Node.js environments.

📝 Checklist

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

[danielroe]

Looks 👌

[nuxt-studio]

✅ Live Preview ready!

Name	Edit	Preview	Latest Commit
nitro	Edit on Studio ↗︎	View Live Preview	94ba884

[codecov]

Codecov Report

Merging #1546 (94ba884) into main (346a61a) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1546      +/-   ##
==========================================
- Coverage   76.38%   76.35%   -0.03%     
==========================================
  Files          73       73              
  Lines        7550     7558       +8     
  Branches      745      744       -1     
==========================================
+ Hits         5767     5771       +4     
- Misses       1782     1785       +3     
- Partials        1        2       +1     

Files Changed	Coverage Δ
src/imports.ts	100.00% <100.00%> (ø)
src/rollup/config.ts	89.77% <100.00%> (-0.80%)	⬇️
src/types/global.ts	100.00% <100.00%> (ø)
src/types/nitro.ts	100.00% <100.00%> (ø)