IO_URING possibility integration

Do you plan to integrate IO_URING possibility for event loop as an addition of EPOLL? It will bring a lot of improvement to Drogon cpp framework.

Start by reviewing Drogon's event-loop implementation and its existing EPOLL integration. The issue does not name files, tests, or a specific acceptance criterion, so first determine the scope and design needed to evaluate IO_URING as an addition; done should include an agreed integration approach and demonstrated event-loop support.

Written by the indexing model from the issue text.