add benchmark tests

NonLinearSolver/materialLaw/STensorOperations.h

NonLinearSolver/modelReduction/Clustering.cpp

NonLinearSolver/modelReduction/TFATools.h

dG3D/benchmarks/ClusteringHS_offlineElastic/CMakeLists.txt

.../benchmarks/ClusteringHS_offlineElastic/RVE_centerInc.geo

.../benchmarks/ClusteringHS_offlineElastic/RVE_centerInc.msh

dG3D/benchmarks/ClusteringHS_offlineElastic/cube.geo

dG3D/benchmarks/ClusteringHS_offlineElastic/cube.msh

dG3D/benchmarks/ClusteringHS_offlineElastic/cube.py

...enchmarks/ClusteringHS_offlineElastic/stiffnessHom_py3.py

dG3D/benchmarks/ClusteringTFA_offlineElastic/CMakeLists.txt

...benchmarks/ClusteringTFA_offlineElastic/RVE_centerInc.geo

...benchmarks/ClusteringTFA_offlineElastic/RVE_centerInc.msh

dG3D/benchmarks/ClusteringTFA_offlineElastic/cube.geo

dG3D/benchmarks/ClusteringTFA_offlineElastic/cube.py

dG3D/benchmarks/ClusteringTFA_offlinePlastic/CMakeLists.txt

...benchmarks/ClusteringTFA_offlinePlastic/RVE_centerInc.geo

...benchmarks/ClusteringTFA_offlinePlastic/RVE_centerInc.msh

dG3D/benchmarks/ClusteringTFA_offlinePlastic/cube.geo

dG3D/benchmarks/ClusteringTFA_offlinePlastic/cube.msh