Add support for twin events and messages

[nacidai]

Add support for ditto twin evenst and messages.

An event represents something that took place in the domain. They are always named with a past-participle verb, such as OrderConfirmed. It’s not unusual but also not required for an event to name an aggregate or entity that it relates to; let the domain language be your guide. Since an event represents something in the past, it can be considered a statement of fact and used to take decisions in other parts of the system.

Muto should add support for events.

https://eclipse.dev/ditto/basic-signals.html

[nacidai]

Alp Sarıca contributed #2