Support richer file management with support for directories

[GCHQDeveloper36]

Problem

Uploading files to an entry is done in a flat style, with no support for hierarchy or mirroring files distributed in a richer format with subdirectories for organisation.

Proposed Solution

Allow users to name files in a path-like structure (e.g. filename is subdir/file.json). When showing a list of files, show these prefixes/paths as folder-like objects that can be expanded or navigated into.

Alternatives

Prefix filenames like subdir-file.json which isn't clear, and breaks naming of files.

What is the priority of your issue?

Low

[IR96334]

Had a little look into possible solutions for this. Feel that using any third-party packages would probably be overkill for our needs. Have each directory be a dropdown that contains some child components that can themselves consist of another dropdown or the file components seems enough. Other, more complex, features like shortcuts, shift-clicking, etc seem superfluous, further pushing me away from using any third-party code.