MpdPidML - add XGBoost to name and allow for multiple identification of particles in a single call

We are currently allowing user to identify one particle per GetMaxProb call. Since XGBoost allows to identify multiple particles in one call to XBoosterPredict, we should allow user to provide several set of parameters (matrix) at once and receive multiple predictions in a single call. Also, to allow for other ML applications, we will add XGBoost to the class name to stress, which software was used to create/use the model.