Implement detector benchmark for the barrel calorimeter for energy resolution

benchmarks/barrel_ecal/scripts/emcal_barrel_electrons_analysis.cxx

@@ -63,6 +63,7 @@ void emcal_barrel_electrons_analysis(const char* input_fname = "sim_output/sim_e
       for (const auto& E2 : sampled)
         result.push_back(E2 / E1);
     }
+    std::cout<<result.size()<<endl;
     return result;
   };