add first version of Hybrid HLLc/Rusanov

src/language/modules/CompositeSchemeOtherFluxesModule.cpp

src/scheme/CMakeLists.txt

src/scheme/HybridHLLcRusanovEulerianCompositeSolver_v2.cpp

src/scheme/HybridHLLcRusanovEulerianCompositeSolver_v2.hpp