vNumber -- the v-number of a graded ideal

Returns the v-number of a graded ideal I. This invariant is used to express the regularity index of the generalized minimum distance function of the ideal I on the parameter $r=1$ genMinDisIdeal. Moreover, the v-number has other combinatorial implications. More information about the v-number can be found in Definition 4.1 at https://arxiv.org/pdf/1812.06529v1.pdf.