Expose underlying connection in Session

Author: mcraveiro

include/sqlgen/Session.hpp

@@ -86,6 +86,11 @@ class Session {
     return conn_->write(_begin, _end);
   }
 
+  int native_socket() const noexcept;
+
+  /// Expose the underlying connection for now.
+  ConnPtr connection() { return conn_; }
+
  private:
   /// The underlying connection object.
   ConnPtr conn_;