add 3 exo full-sim relvals

-  add EXO relvals for HLT and POG-signature validation: RSGravitonToGammaGamma HSCPstop-fract-charge WprimeToENu
- agreed upon at DQM/PdmV joint meeting https://indico.cern.ch/event/294178/contribution/2/material/slides/0.pdf https://indico.cern.ch/event/294179/contribution/1/material/slides/0.pdf