[Dashboard] TcpServer high CPU usage

[Dynesshely]

Discussed in #258

经过初步检查, 初步判定并不是代码编写逻辑的问题, 而是 TcpListener.Pending 方法占用 CPU 资源过多, 相关代码如下:
Network/DevicesServer.cs

    /// <summary>
    /// 接收客户端
    /// </summary>
    private static void AcceptClient()
    {
        var location = $"{nameof(DevicesServer)}.{nameof(AcceptClient)}";

        try
        {
            while (keepListen && listener is not null)
            {
                if (listener.Pending()) // <- HERE
                {
                    var client = listener.AcceptTcpClient();

                    if (client.Client.RemoteEndPoint is not IPEndPoint endpoint) continue;

                    clients.Add(endpoint.ToString(), client);

                    Log.Information($"New device connection: {endpoint}");

                    ReceiveMessage(client);
                }
            }
        }
        catch (Exception ex)
        {
            Log.Error(ex, $"In {nameof(location)}: {ex.Message}");

            Status = ServerStatus.Errored;
        }
    }

Network/PluginsServer.cs

    /// <summary>
    /// 接收客户端
    /// </summary>
    private null void AcceptClient()
    {
        var location = $"{nameof(PluginsServer)}.{nameof(AcceptClient)}";

        try
        {
            while (keepListen && listener is not null)
            {
                if (listener.Pending()) // <- HERE
                {
                    var client = listener.AcceptTcpClient();

                    if (client.Client.RemoteEndPoint is not IPEndPoint endpoint) continue;

                    clients.Add(endpoint.ToString(), client);

                    Log.Information($"New plugin connection: {endpoint}");

                    ReceiveMessage(client);
                }
            }
        }
        catch (Exception ex)
        {
            Log.Error(ex, $"In {location}: {ex.Message}");

            Status = ServerStatus.Errored;
        }
    }

占用情况如图. 基本上占用一半的资源, 另一半则是 sockets 库

修改建议为适当增加线程休眠时间, 如:

Thread.Sleep(500);

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Tracked by #223 .