security: Display security info for apps
From a discussion with @federico, here is some security information that we can display for each app:
- if the app has been sandboxed and/or reviewed
- a count of past cves
- a count of current cves (using debsecan #1609 (closed))
This is to help the user understand if there is a risk when using the app. This is especially useful for packages installed from backports, as backports does not have the same level of security support (https://backports.debian.org/FAQ/).