feat(components): Implement ComponentVersion event emission and IssueMatch creation

[dorneanu]

Task Description
Implement event emission functionality for ComponentVersion attachments to issues and create corresponding IssueMatches for related ComponentInstances.

The system needs to:

1. Emit events when a ComponentVersion is attached to an issue
2. Process these events to create IssueMatches for all ComponentInstances that are associated with the attached ComponentVersion

Acceptance Criteria:

• Implement event emission when a ComponentVersion is attached to an issue
• Create an event handler to process ComponentVersion attachment events
• For each ComponentInstance associated with the ComponentVersion, create a corresponding IssueMatch
• Ensure proper error handling and logging throughout the process

[dorneanu]

Brain dump: For each ComponentInstance, build IssueVariantMap (needed for Severity) and create IssueMatch. BuildIssueVariantMap needs to be a shared functionality.

[dorneanu]

GetTargetRemediationTimeline needs to be a shared functionality (maybe in internal/app/shared). This way one function for dealing with the remediation timeline.

[dorneanu]

This is now ready for review. I'll create a PR.