Add support for AV classifications as a first-class Bundle entity

[ikiril01]

Running malware through AV engines is a common analysis process and thus we should have a more standard way of capturing it in the Bundle. In addition, we should make sure we have the ability to capture the historical of context of AV runs, since this data can be useful for determining, for example, the different classifications that a sample was given over time.

[ikiril01]

Added in commit dff5140426f5d6b368f44c7f08f93a64989e9a73.