Bsd: Implement Select (#4017)

* bsd: Add gdkchan's Select implementation

Co-authored-by: TSRBerry <20988865+tsrberry@users.noreply.github.com>

* bsd: Fix Select() causing a crash with an ArgumentException

.NET Sockets have to be used for the Select() call

* bsd: Make Select more generic

* bsd: Adjust namespaces and remove unused imports

* bsd: Fix NullReferenceException in Select

Co-authored-by: gdkchan <gab.dark.100@gmail.com>

Ryujinx.HLE/HOS/Services/Sockets/Bsd/ISocket.cs

@@ -1,4 +1,5 @@
-using System;
+using Ryujinx.HLE.HOS.Services.Sockets.Bsd.Types;
+using System;
 using System.Net;
 using System.Net.Sockets;