Method get_elapsed_micro

include/rabitqlib/utils/stopw.hpp:25–27

    }

    [[nodiscard]] float get_elapsed_micro() const {
        return std::chrono::duration<float, std::micro>(elapsed()).count();
    }

    [[nodiscard]] float get_elapsed_nano() const {
        return std::chrono::duration<float, std::nano>(elapsed()).count();