Method enqueue

tests/fl/channels/spi_channel.cpp:501–510

    }

    void enqueue(ChannelDataPtr channelData) override {
        if (channelData) {
            enqueueCount++;
            // Snapshot the encoded bytes now, before poll() can clear them
            const auto& src = channelData->getData();
            fl::vector<uint8_t> copy;
            copy.insert(copy.end(), src.begin(), src.end());
            capturedData.push_back(fl::move(copy));
        }
    }

    void show() override {
        showCount++;