Implement a loading section for packages that are being installed

[pablomendezroyo]

When installing a package there is a spinner in the bottom right corner letting you know the status. Installing packages is a task that may take some minutes, users can get frustrated and if they refresh the page, the spinner is lost and they do not know what's going on.

Implement a packages installing progress view to be shown always, as soon as there are packages been installed / updated in the background. Use the isInstalling implemented feature in the backend to send this to the frontend