Add default event "connection"

[sikelio]

Is your feature request related to a problem? Please describe.
Currently the library doesn't include a native event like "connection" like the node js lib

Describe the solution you'd like
An implementation of the "connection" event for getting informations when a user connects to the websocket instance.

io.on("connection", (socket) => {
  console.log(socket.id); // ojIckSD2jqNzOqIrAGzL
});

It could be useful like getting in realtime the users connected to the instance and not getting the socket id when a specific event is triggered.
I could be interesting to get the user IP, MAC or device name for administration on this event.

Describe alternatives you've considered
Parsing information from every triggered event but it's not really realtime because it needs that a user sends an event.

[Totodore]

In the socket.io API, the connection event is an alias of the connect event. Which corresponds to a connection of a socket to a namespace (the default in the example you gave).

https://docs.rs/socketioxide/latest/socketioxide/handler/connect/index.html

[sikelio]

Oh thanks man ^^
I didn't saw it because i'm actually learning rust :/