SSE Scalability

[kobergj]

There is a technical issue when running multiple sse service instances.

Consider running two sse instances A and B. When calling /sse endpoint you will be connected to one of them, let's say A. But when an event happens only one of the services will get it, because they are both in the same consumer group. If service B gets the event it will not be able to send a message to the client because the sse library we are using is storing connections in memory (which makes sense because there is no need to persist them).

This PR adds unique consumer groups to each sse service. This way all services will get all events and can therefore always transmit the message to the client.

[sonarcloud]

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