UDPSink 从配置读取配置并兼容官方

下面是一个示例，演示如何从配置文件中读取UDP Sink的配置，并且兼容官方的Sink配置：

using System;
using System.Net;
using System.Net.Sockets;
using Serilog.Configuration;
using Serilog.Core;
using Serilog.Events;

public static class UdpSinkExtensions
{
    public static LoggerConfiguration UdpSink(
        this LoggerSinkConfiguration loggerConfiguration,
        string host,
        int port)
    {
        return loggerConfiguration.Sink(new UdpSink(host, port));
    }

    public static LoggerConfiguration UdpSink(
        this LoggerSinkConfiguration loggerConfiguration,
        IPEndPoint endPoint)
    {
        return loggerConfiguration.Sink(new UdpSink(endPoint));
    }

    public static LoggerConfiguration Udp(
        this LoggerSinkConfiguration loggerConfiguration,
        string host,
        int port)
    {
        return UdpSink(loggerConfiguration, host, port);
    }

    public static LoggerConfiguration Udp(
        this LoggerSinkConfiguration loggerConfiguration,
        IPEndPoint endPoint)
    {
        return UdpSink(loggerConfiguration, endPoint);
    }
}

public class UdpSink : ILogEventSink, IDisposable
{
    private readonly UdpClient _client;
    private readonly IPEndPoint _remoteEndPoint;

    public UdpSink(string host, int port)
        : this(new IPEndPoint(IPAddress.Parse(host), port))
    {
    }

    public UdpSink(IPEndPoint endPoint)
    {
        _client = new UdpClient();
        _remoteEndPoint = endPoint;
    }

    public void Emit(LogEvent logEvent)
    {
        var logMessage = logEvent.RenderMessage();
        var logBytes = System.Text.Encoding.UTF8.GetBytes(logMessage);
        _client.Send(logBytes, logBytes.Length, _remoteEndPoint);
    }

    public void Dispose()
    {
        _client?.Close();
    }
}

这个示例中，我们定义了两个构造函数，一个接受主机和端口号，另一个接受一个`IPEndPoint`对象。然后，我们定义了`UdpSinkExtensions`类，提供了两个扩展方法，用于在Logger中添加UDP Sink。

接下来，我们可以在配置文件中添加UDP Sink的配置：

{
  "Serilog": {
    "WriteTo": [
      {
        "Name": "Udp",
        "Args": {
          "host": "127.0.0.1",
          "port": 514
        }
      }
    ]
  }
}

或者，可以使用官方的Sink配置：

{
  "Serilog": {
    "WriteTo": [
      {
        "Name": "UdpSink",
        "Args": {
          "host": "127.0.0.1",
          "port": 514
        }
      }
    ]
  }
}

这样，我们就可以从配置文件中读取UDP Sink的配置，并且兼容官方的Sink配置。