Draft: Implementation of ONNX model score computation and decoration for Taus (GNTau)

Add tools and wrappers to run ONNX-based models for Tau objects. Details can be found in FTag software meeting presentation, but in short: a new class and tool are added to tauRecTools along with some new variable calculator functionalities to run model inference and decorate TauJets and TauTracks, and DerivationFrameworkTau + tauRec are modified to call the tools and decorate the DAOD TauJets (if one also decorates the DeepSetID at the moment).