Add an event bus system to standardize the listeners and emitters system

[vincentcourtois]

Context

We currently have several emitters and subscribers for events and we should have a system standardizing it.

Needs

As a developer of the application
I want to be able to subscribe and emit events in a unified event bus
So that I can Add new features regarding events

Notes

• Add the possibility to subscribe to events only inside the current module (either by subscribing to them, or by implementing it in the components).
• Add a documentation for the format of the payload of the messages passed in the event bus.