feature request- add vulnerability count display

[cokerrd]

Feature Request
Currently, when viewing vulnerabilities in the extensions view, I see a list of vulnerabilities grouped by severity (CRITICAL, HIGH, MEDIUM, LOW), but there is no visual indication of how many vulnerabilities exist in each severity category without expanding each section

I would like to see the number of vulnerabilities displayed next to each severity level in the tree view. For example:

• 🔴 CRITICAL (10)
• 🟠 HIGH (5)
• 🟡 MEDIUM (8)
• 🔵 LOW (3)

This feature would improve the developer experience by:

1. Providing instant visibility into the security status
2. Helping prioritize critical/high severity issues
3. Making it easier to track progress when fixing vulnerabilities

[cokerrd]

I'm happy to contribute to this if it is approved