add benchmark for sampling calorimeter

.gitlab-ci.yml

benchmarks/sampling_ecal/compact/barrel_ecal_test.xml

benchmarks/sampling_ecal/config.yml

benchmarks/sampling_ecal/options/sampling_cluster3d.py

benchmarks/sampling_ecal/requirements.txt

benchmarks/sampling_ecal/run_emcal_barrel.sh

benchmarks/sampling_ecal/scripts/draw_cluster.py

benchmarks/sampling_ecal/scripts/draw_cluster_layers.py

benchmarks/sampling_ecal/scripts/energy_profile.py

benchmarks/sampling_ecal/scripts/epi_separation.py

benchmarks/sampling_ecal/scripts/gen_particles.py

benchmarks/sampling_ecal/scripts/utils.py