examples: update with-wasm

[pi0]

🔗 Linked issue

❓ 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

• Enabled nitro.wasm feature flag
• Add sum.wat
• Use lazyHandle to initiate wasm module (instead of per request)
  • TODO: Support top-level await in API files
• Add initWasmModule helper

Note:s

• Seems reactivity with useAsyncData fn is broken(!) for this example disabled user input

📝 Checklist

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

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