Better log socket.io events

[LoicPoullain]

Issue

The new logging system introduced in v4.1 enhances logging of HTTP requests. It does not handle socket.io events.

Solution and steps

• [x] Update Logger.
• [x] Update SocketIOController.

Checklist

• [x] Add/update/check docs (code comments and docs/ folder).
• [x] Add/update/check tests.
• [x] Update/check the cli generators.