feat: support binary server assets

[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

We initially introduced server assets to allow serving small nonbinary data such as HTML templates, JSON, and Markdown files.

@atinux was working on a POC that encountered the limitation of needing to bundle binary data.

This PR allows this by converting non-recognized extensions to base64 encoded string and restoring to ArrayBuffer at runtime.

This is a quick way to support the feature however for platforms that natively support filesystem access, not performant at all and later we shall improve it. So unless you have to, don't use it!

📝 Checklist

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