feat(nitro): add http.server timeout configuration

[hareku]

🔗 Linked issue

Related nuxt/bridge#149

❓ 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

I added NITRO_TIMEOUT, NITRO_KEEP_ALIVE_TIMEOUT and NITRO_HEADERS_TIMEOUT to set http.server's timeout, keepAliveTimeout and headersTimeout.

📝 Checklist

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

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[pi0]

Thanks for the PR @hareku. I believe it makes sense but we probably need to add it's support via node preset options since these are not universal flags for server. I'm closing this issue to wait for Nitropack support (#3161) first and that we can properly test this addition but be assured will be added back 💚