Add Jaccard Index

Jaccard index allows to evaluate evaluator's quality, as it measures the overlap between baseline and generated report. The better the approximation of the baseline, the higher value of Jaccard's index.

added devopssecure groupvulnerability research sectionsec typefeature workflowin dev labels

requested review from @julianthome and @idawson

assigned to @martynaskrupskis

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added Community contribution label

Looks great @martynaskrupskis ... approving and mergeing

approved this merge request

merged

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