Add vulnerability class to the report

[fardin01]

Description

This commit adds the vulnerability class (os-pkgs or lang-pkgs) to the report so that it becomes possible to identify vulnerabilities based on this.

Related issues

Fixes #564

Checklist

• I've read the guidelines for contributing to this repository.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).

[CLAassistant]

All committers have signed the CLA.

[chen-keinan]

@fardin01 thank you for the contribution ,this could be a nice addition.
in last release we have introduced a new capabilities for adding new fields to vulnerability report #468 , it will be great if you could extend it in the same way to introduce the class field , so we could have better control

[chen-keinan]

@fardin01 if you wish to discuss it in details I'll be happy. you can find me on Slack

[fardin01]

@chen-keinan Thanks for your feedback, it's certainly better this way. Please take another look. Once you're okay with the changes I will update the docs too.

[chen-keinan]

@fardin01 look's good , could you please:

• Update comment on supported values on Helm values yaml file
• Update docs as well

[chen-keinan]

@fardin01 LGTM 🚀 thanks you for the contribution , I'm cutting a release today , I'll merge the code after the release.