Retrieve pictures and inferences for a given folder

[sylvanie85]

ai-cfia/nachet-frontend#172 : "As a User, I'd like to be able to access the pictures from other folders"

backend related issue : ai-cfia/nachet-backend#105

We want two new functions that correspond to the backend routes : first, we want to retrieve only the names of the pictures, if they've been verified or come from a batch download, for example.
Then, if the user clicks on a picture, we'll retrieve the inference and the picture from blob storage.

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

    User->>FE: ApplicationStart()
        FE-->>BE:  /directories
            BE->>DS: get_picture_sets_info(user_id)
                loop for each picture set
                    DS-->DS: get_pictures(user_id, picture_set_id)
                end
            DS-->>BE: List of picture_set with pictures data
        BE-->>FE: Response : List of picture_set with pictures name
    User->>FE: Select Folder
    FE-->>User: Display folder content (list of pictures)
    User->>FE: Select Picture
        FE->>BE: /get-picture
            BE->>DS: get_picture_inference(user_id, picture_id)
                DS-->DS: get_picture_inference(user_id, picture_id)
            DS-->>BE: Return inference as a json if exist
            BE->>DS: get_picture_blob(user_id, picture_id)
                DS-->DS: get_blob(user_id, picture_set_id)
            DS-->>BE: Return blob from azure storage
        BE-->>FE: Response : blob and inference of the picture
    FE-->>User: Display picture with inference if exist

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• update get_picture_sets_info function to retrieve pictures names and other details
• new get_picture_inference
• new get_picture_blob