Add a NotImplementedError exception when using sockets with MPI

src/utils/Socket.cpp

 #include <utils/Exceptions.hpp>
 #include <utils/Socket.hpp>
 
+#include <utils/Messenger.hpp>
+
 #include <arpa/inet.h>
 #include <cstring>
 #include <iostream>
@@ -62,7 +64,12 @@ class Socket::Internals
   Internals(const Internals&) = delete;
   Internals(Internals&&)      = delete;
 
-  Internals(bool is_server_socket = false) : m_is_server_socket{is_server_socket} {}
+  Internals(bool is_server_socket = false) : m_is_server_socket{is_server_socket}
+  {
+    if (parallel::size() > 1) {
+      throw NotImplementedError("Sockets are not managed in parallel");
+    }
+  }
 
   ~Internals()
   {