Hi, thanks for the awesome work on socketioxide!

I'd like to propose a feature: a built-in method to retrieve all currently connected sockets for a namespace (or globally).
This would simplify managing server state for broadcasting, inspecting socket info, etc.

Currently, the only way to do this is to manually track sockets like in a HashMap or smth during connection and disconnection events, which is error-prone and adds boilerplate.

Example API (hypothetical):