Add Thumbnails to files

[waltzz92]

Is your feature request related to a problem? Please describe.
A thumbnail is a preview of a file before you click it. IPFS Desktop currently doesn't support thumbnails at all. This makes it hard to find certain images and videos in a folder, especially in a large gallery.

Describe the solution you'd like
Add thumbnails for files added to IPFS Desktop.

Describe alternatives you've considered
There could be two ways to view files in a node. A list view, like we have right now, and a thumbnail view.

Additional context
None.

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