[Feature request] Add custom attributes to assets

[gelven4sec]

What's the problem this feature will solve? To help calculating the priority between assets that needs to be patched, I assigned them some attributes, and I would like to reflect them in Faraday. The 3-stars "importance" attribute isn't enough, I would need to add some custom.

Describe the solution you'd like Implement custom attributes the same way as with vulnerabilities.

Vulnerabilities:

Assets:

Alternative Solutions I don't think anything else than custom attributes on assets is needed here.

Additional context Let me know if you need more information.

And thanks for this awesome project.