[unstorage] HTTP file uploads

[muety]

First of all, very cool project!

I was wondering whether I could (mis)use unstorage as a simple file upload server. I'd like to be able to upload raw, binary files (e.g. a PNG image), preferably as FormData, and then access them later with a simple GET request, e.g. from the browser or cURL. In the best case, unstorage would even guess the mime type from the file's ending and set the content-type header accordingly. But for now, I'd already be happy with a way to upload binary files via the built-in HTTP server without the content being serialized to text on the way.