Upload data dictionary component ui

[rmanaem]

This component should handle the following

• uploading of a .json file
  • [ ] prompt the user to create them an empty data dictionary if they don't have one to upload
  • Perhaps something we can add at a later time
• showing a preview of the file
  • preview should be collapsable

Aside from component functionalities:

• a test for the new component

[rmanaem]

Blocked until #21 is addressed

[rmanaem]

@neurobagel/dev
Any thoughts on the preview for a data dictionary?
The expand all/collapse all only expands the first level (columns)

A bit of styling:

[alyssadai]

Interesting! @rmanaem, does that mean if the user wanted to see the data dictionary preview in full, they would have to first manually expand each level?

If so, I may prefer a version where I can simply expand or collapse the full raw JSON file. A little less fancy, but does the job I think - it would also allow the user to quickly catch formatting/obvious problems in the raw file (which I suspect the current styling may hide?).

Alternatively, if there's a way to always show the top-level keys, but be able to expand/collapse everything else at once, I think that also works. But I don't think it's super necessary.