feat: vex output

[sozercan]

Signed-off-by: Sertac Ozercan sozercan@gmail.com

Describe the changes in this pull request using active verbs such as Add, Remove, Replace ...
Add support for VEX output

Closes #87

example output (nginx:1.21.6): https://snips.sh/f/JReDjyIUmp

[codecov]

Codecov Report

Patch coverage: 55.82% and project coverage change: +2.48% 🎉

Comparison is base (67e8932) 29.30% compared to head (2816e3a) 31.78%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #272      +/-   ##
==========================================
+ Coverage   29.30%   31.78%   +2.48%     
==========================================
  Files          16       18       +2     
  Lines        1498     1598     +100     
==========================================
+ Hits          439      508      +69     
- Misses       1034     1062      +28     
- Partials       25       28       +3     

Files Changed	Coverage Δ
pkg/patch/patch.go	6.36% <0.00%> (-1.09%)	⬇️
pkg/pkgmgr/pkgmgr.go	12.98% <0.00%> (ø)
pkg/report/qualys.go	14.86% <0.00%> (ø)
pkg/pkgmgr/rpm.go	33.67% <47.82%> (+0.52%)	⬆️
pkg/patch/cmd.go	52.94% <50.00%> (-0.40%)	⬇️
pkg/pkgmgr/dpkg.go	34.64% <50.00%> (+1.06%)	⬆️
pkg/pkgmgr/apk.go	51.49% <57.14%> (+1.10%)	⬆️
pkg/vex/vex.go	78.57% <78.57%> (ø)
pkg/vex/openvex.go	87.75% <87.75%> (ø)
pkg/report/trivy.go	76.31% <100.00%> (ø)

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