Generate VEX docs for pkgs

[dr-housemd]

Certain packages have CVEs whose score is higher than it needs to be or isn't a valid CVE for the package.
Industry's effort to fix this is VEX documents. This will help eliminate false positives.
Common ways VEX docs can be found are-

• Find one by published by the security advisory
• Generate one by dynamic analysis of syscalls
• Potentially, leverage something like VexHub