[Feature]: Handle folder upload

[RezaRahemtola]

Description

Instead of displaying an error on folder uploads, make it work 🚀

Expected behaviour

Users should be able to select a folder instead of a file, and the whole folder and it's content should be uploaded on Aleph.

Think about:

• Recursion
• If a folder creation fails, you can't upload the files in it (or they won't be displayed)

Environment

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Proposed solution

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