In package.json, move @types/* from dependencies to devDependencies #5073

Describe the bug
Currently, engine.io has @types/cookie, @types/cors and @types/node as dependencies. They should instead be devDependencies.

https://github.com/socketio/engine.io/blob/7033c0ed278705b569afef0bfe470c1937d1ec38/package.json#L33-L36

This is causing my projects to take many more packages as dependencies at runtime.