feat: support raw conversion in envs without Buffer

[itpropro]

🔗 Linked issue

#142

❓ 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

Replaced Buffer with native implementation to also run on workers and other environments. It's also faster than Buffer, but in the context of unstorage, the improvement is not significant.

📝 Checklist

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

[itpropro]

The netlify tests seem to be very flaky and slow, we should probably disable them (95% of them ran into timeout on my machine) until the driver is fixed or a faster way of testing is found.

[GalacticHypernova]

How would this translate to getItemRaw with the web streams? Would it still be possible for the response of the image to be automatically rendered correctly as an image on the browser?

[cloudflare-workers-and-pages]

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[pi0]

Thanks ❤️