Enhancement for Azure Service Bus Activities

[jdevillard]

Originally posted by @sfmskywalker in https://github.com/elsa-workflows/elsa-core/issues/749#issuecomment-797483211

I propose the following step/idea to update the Azure Service Bus Activities :

• [ ] Implement opt-in/out to check / create service bus entity and give a clear Exception Message
• [ ] Enhance Message Model
• [ ] Allow ability to select custom Serializer
• [ ] Add capacity to configure Azure Storage Fallback for large message
• [x] Check new Azure.Messaging.ServiceBus library
• [x] Allow choice of Request/Reply Pattern or Fire And Forget pattern through configuration or Composite Activity

feel free to propose other ideas , I can take the dev on theses differents points, submit PR and update this issue