Consolidate the control plane implementations

[wkerckho]

There are various components that use control signaling for triggering actions across the micro-services. For example:

• The Catalog service uses a Pulsar topic to schedule data exports.
• A Redis-based session manager component is used to remotely close data streaming sessions (SSE).

It does not make sense that the platform has different ways of implementing control signaling and these approaches should be consolidated.

[MisterTimn]

So for our specific case we should choose between Redis and Pulsar or more ideally between using the MessageBroker abstraction being introduced through #22 and the Redis abstraction for #23?

Or would this ideally be a third abstraction?

[wkerckho]

Because use of control messages is limited, I would indeed propose to choose one of the abstractions.

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