Add io_uring support

This project adds support for dump and restore of io_uring instances. The three main goals of this project is to handle dump/restore of empty io_uring, dump/restore of io_uring with completed events and no inflight events, and dump/restore of io_uring with in flight as well as completed events. The ring buffer needs to replay unconsumed entries on restore in a way that is transparent to the application. This project achieves these objectives.