Add an "upload" column type and GUI widget

[scudette]

Currently we can include some data in a JSON column and mark it as "base64hex" for example to get a hex viewer of the data

velociraptor/gui/velociraptor/src/components/core/table.jsx

Line 556 in aaeb4d7

case "base64hex":

This is useful but limited because if we add too much data into the collection JSON it will kill the GUI since the GUI API is limited to 5mb REST calls.

We need a widget that can read unlimited data via the upload mechanism - so the collection just uses upload() normally but the GUI offers a way to view the raw data easily for quick triage and review.

[scudette]

Fixed by #2412