feat(add-data): Add modal to import data via file upload

[david-bretaud-dev]

Highlights

1. Add "add-data" feature slice.
2. Add Dialog from shadcn CLI
3. I had an issue with some container breakpoints used by shadcn (max-w-lg) => the dialog sized was wronged. Why ? because of the spacing custom tokens added in the style. I removed it (and their usage) to be sure we don't have conflicts with native containers token.

Demos

UI only

demo-upload-file-data-ui.mp4

Full flow

Waiting for backend