Improve exception safety with smart pointers

Would you like to [wrap any pointer data members](https://github.com/memtt/numaprof/blob/6edaaf2b4cfdd8e8830111305345c352146154e1/src/lib/caches/CpuSimpleFlatCache.cpp#L22 "Update candidate: CpuSimpleFlatCache class") with the class template “[std::unique_ptr](https://en.wikipedia.org/wiki/Smart_pointer#unique_ptr "Description for the usage of smart pointers")”?