Added multi-part upload function

[wwwwjjq]

Is this a new feature request?

• I have searched the existing issues

Wanted change

Because I use the cloudflare proxy, the maximum upload file size is limited to 100M. Can you add the multi-part upload function

Reason for change

Because I use cloudflare proxy, the maximum upload file size is limited to 100M. Can you add a multi-part upload function to split a book into multiple small parts and upload them and then merge them on the server, so that we can upload large books

Proposed code change

No response

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[j0nnymoe]

You would need to request this from the upstream project.

[drizuid]

closing this as we are not the devs of calibre-web.