ssl: Implement SSL connectivity (#2961)

* implement certain servicessl functions

* ssl: Implement more of SSL connection and abstract it

This adds support to non blocking SSL operations and unlink the SSL
implementation from the IPC logic.

* Rename SslDefaultSocketConnection to SslManagedSocketConnection

* Fix regression on Pokemon TV

* Address gdkchan's comment

* Simplify value read from previous commit

* ssl: some changes

- Implement builtin certificates parsing and retrieving
- Fix issues with SSL version handling
- Improve managed SSL socket error handling
- Ensure to only return a certificate on DoHandshake when actually requested

* Add missing BuiltInCertificateManager initialization call

* Address gdkchan's comment

* Address Ack's comment

Co-authored-by: InvoxiPlayGames <webmaster@invoxiplaygames.uk>

Ryujinx.HLE/HOS/Services/Ssl/SslService/ISslConnectionBase.cs

@@ -0,0 +1,25 @@
+using Ryujinx.HLE.HOS.Services.Sockets.Bsd;
+using System;
+using System.Net.Sockets;
+
+namespace Ryujinx.HLE.HOS.Services.Ssl.SslService
+{
+    interface ISslConnectionBase: IDisposable
+    {
+        int SocketFd { get; }
+
+        ISocket Socket { get; }
+
+        ResultCode Handshake(string hostName);
+
+        ResultCode GetServerCertificate(string hostname, Span<byte> certificates, out uint storageSize, out uint certificateCount);
+
+        ResultCode Write(out int writtenCount, ReadOnlyMemory<byte> buffer);
+
+        ResultCode Read(out int readCount, Memory<byte> buffer);
+
+        ResultCode Peek(out int peekCount, Memory<byte> buffer);
+
+        int Pending();
+    }
+}