Chunked file uploads

[Mase3206]

If your GNS3 server is behind a Cloudflare tunnel (like mine is), file uploads larger than 100MB are blocked due to a restriction on Cloudflare's end (returns HTTP 413). This could be fixed by automatically chunking the file to be uploaded into multiple archives less than 100MB in size, uploading them, and re-assembling them. This should also be considered for implementation in the native desktop app.

Once I get more comfortable with TypeScript, I may look at implementing this myself.