Draft: Origin vertex functor collection

MR implements a new functor collection, containing candidate-based variables related to a vertex different from the BPV one.

So far only FDCHI2 and IPCHI2 are implemented, but more can be added before merging.

FD and IP are commented out, since some changes are still needed to make these work (see Rec#403).

DaVinci example can be found here DaVinci!932 (closed).

Goes with Rec!3444 (merged) and Rec!3489 (merged) and Rec!3650 and DaVinci!932 (closed)

@tfulghes @abertoli @erodrigu @pkoppenb @amathad @jzhuo