PWGHF: extend RecoDecay::getCharmHadronOrigin functionality

[fcatalan92]

Extend the functionality of RecoDecay::getCharmHadronOrigin to return the index of the found mother, which is useful to retrieve, e.g., the pT of the mother B hadron, and remove the code duplication introduced in #6017.
@Mingyu3360715 @atavirag

[fgrosa]

RecoDecay::getCharmHadronOrigin was modified in this #6162, adding the functionality to retrieve the B-mother pT for the D*. It can be used as an example also for the D0 code @Mingyu3360715 @atavirag