Allow publishing events from consumers

[OlliMartin]

Currently the acaad.consumer framework only allows pushing state (i.e. component) changes to the C# service.
The C# service could be extended to host an /events (or such) API endpoint which will "inject" custom provided events into the event bus, which subsequently can be used in the configuration as a trigger.
ioBroker, for example, has a neat integration with the notification-manager adapter, that would make it very simple to integrate with HA systems.

[OlliMartin]

Note: For an ioBroker implementation it seems it is not possible to establish/configure a mapping between the event/notification category and which server to send it to (which makes sense).
However, this should not be a problem. Either we can send the event in a fan-out style or even let the user configure on device (acaad server) level if it participates in events/notifications.
This can be done both from the object tree or directly in the instance settings.
Pushing these events is trivial and comes with basically no overhead, so an MVP implementation should just be a fan-out over all devices.