Add OWASP vector to enrich command output

[fahedouch]

Hello,

Currently, vens enrich only adds the OWASP score to the report but not the vector string that explains how that score was calculated.

Current output:

json "Custom": { "owasp_score": 52.0 }

Expected output:

json "Custom": { "owasp_score": 52.0, "owasp_vector": "SL:7/M:7/O:7/S:7/ED:6/EE:6/A:6/ID:3/LC:7/LI:7/LAV:7/LAC:7/FD:7/RD:7/NC:7/PV:7" }

The vector is already present in the VEX file generated by vens generate, we just need to extract it during enrichment.

Hint: Look at pkg/vexenricher/enricher.go - you'll need to store and apply the vector similar to how the score is handled.