Add HappyEyeballs (#9772)

* Add HappyEyeballs

* Clean up the code

* Fix

v2rayN/ServiceLib/Models/Configs/Config.cs

@@ -34,6 +34,7 @@ public class Config
     public List<KeyEventItem> GlobalHotkeys { get; set; }
     public List<CoreTypeItem> CoreTypeItem { get; set; }
     public SimpleDNSItem SimpleDNSItem { get; set; }
+    public HappyEyeballs4RayItem HappyEyeballs4RayItem { get; set; }
 
     #endregion other entities
 }

v2rayN/ServiceLib/Models/Configs/ConfigItems.cs

@@ -285,4 +285,14 @@ public class SimpleDNSItem
     public bool? ParallelQuery { get; set; }
     public string? Hosts { get; set; }
     public string? DirectExpectedIPs { get; set; }
+    public bool? EnableHappyEyeballs { get; set; }
+}
+
+[Serializable]
+public class HappyEyeballs4RayItem
+{
+    public int? TryDelayMs { get; set; }
+    public bool? PrioritizeIPv6 { get; set; }
+    public int? Interleave { get; set; }
+    public int? MaxConcurrentTry { get; set; }
 }