As a User, I'd like to be able to access the pictures from other folders

## Context:
Currently, our users are able to create new folders and batch upload into a folder. However they are not able to access the content of theses folder.

```mermaid
sequenceDiagram
participant User
participant FE as Frontend
participant BE as Backend
participant DS as Datastore

User->>FE: Select Folder
FE->>BE: Request folder content
BE->>DS: Fetch folder content
DS-->>BE: Return folder content
BE-->>FE: Send folder content
FE-->>User: Display folder content (list of pictures)
```

## Acceptance Criteria:

1. User can select any folders present in its container
2. The user can navigate through the selected folder content
3. The user can see the pictures within the selected

## TODO:

### Frontend
- [ ]
### Backend
- [x] https://github.com/ai-cfia/nachet-backend/issues/105
### Datastore
- [x] https://github.com/ai-cfia/nachet-datastore/issues/69