fix(aws-lambda-streaming): handle additional XMLHttpRequestBodyInit types

[Jhinger]

Open to feedback as I'm sure this isn't the most elegant way to handle this, however it did resolve the issue I was experiencing in the linked issue.

🔗 Linked issue

#2613

❓ 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

I would get the error reader.getReader is not a function whenever I tried to redirect from a SolidStart api route - the request body returned by nitroApp.localCall can be of type ReadableStream or XMLHttpRequestBodyInit, the latter was not being handled which was causing the error.

📝 Checklist

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

[shunjilin]

Just to add, my team was in the process of upgrading our regular APIs to the stream-based API for certain routes that needed to support streams, and this fix works with the regular routes as well