Merge "Use std::optional instead of std::unique_ptr"

private:

    status_t readFloatVector(

            const Parcel* parcel, Vector<float> *vectorPtr, size_t defaultLength) {

        std::unique_ptr<std::vector<float>> v;

        std::optional<std::vector<float>> v;

        status_t result = parcel->readFloatVector(&v);

        if (result != OK) return result;

        vectorPtr->clear();

        if (v.get() != nullptr) {

        if (v) {

            for (const auto& iter : *v) {

                vectorPtr->push_back(iter);

            }