Missing perfetto counter track names

[jrmadsen]

perfetto_counter_track needs to use:

    using name_map_t  = std::map<uint32_t, std::vector<std::unique_ptr<std::string>>>;

instead of

    using name_map_t  = std::map<uint32_t, std::vector<std::string>>;

because the underlying C-string passed to perfetto::CounterTrack (i.e. perfetto::CounterTrack{ _name.c_str() }) is occasionally invalidated when the vector is reallocated. This typically shows up in the rocm-smi GPU samples