Change project and all object names Event to ServiceBroker

[matteopessina]

EventBus, event are concept specific to the Pub/Sub pattern.
AzureServiceBus and RabbitMQ provide more messaging patterns, such as queue (or direct exchange in AMQP).
To be more uniform and use an ubiquitous language I expect to find ServiceBroker every time is now Event, Eventbus, etc.