Feature: Implement an upload manager interface

[faisalsayed10]

Currently, there is a simple toast that shows the file's progress while it is being uploaded. We want to change that to show a Google Chrome-like downloads UI from where a user can manage their ongoing uploads and resume unfinished uploads. I'm thinking of a simple notion-like sidebar that expands into a full page on a button click.

There is also a case to handle when it comes to file uploading:

CASE: The upload continues sometime later after closing the window / on a different computer:

• check for all the ongoing uploads from the bucket's API, and list them in the upload manager
• when resumed - get the upload data from the API → start the upload again with the remaining chunks.