fix(azure): pass body to the context as-is

[pi0]

🔗 Linked issue

resolves #100

❓ 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

When sending a binary/Buffer response, azure natively handles it and we don't need to stringify it. (Note: h3 stringifies objects and alike already)

PS: I locally confirmed working based on tests in #2076

📝 Checklist

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