Currently, the code uses boost::system to manage error handling. Within it, the majority of occurrences are of boost::system::error_code.

Dependencies on boost::system::error_code could be removed by using std::error_code, but that could probably result in a loss of compatibility with boost::asio. The loss of compatibility is not necessary (we can only know by testing), but the best way to remove boost::system dependency would be to remove boost::asio dependency along with it as well. However, removing boost::asio is not trivial. So try to find a way to remove boost::system dependency without breaking the code, and then test it to confirm that the code indeed works as expected. If this is not possible, then we will have to replace boost::asio by some standard library as well.

This PR might be relevant for removing boost::asio: https://github.com/STEllAR-GROUP/hpx/pull/5158/files