SDP operator engineering user interface(s)

While to a certain extent aspects of this exists already in the form of:

• The UI provided by Webjive/Tarana for the SDP subarray device
• Logging dashboards provided by the ELK stack (ie Kibana)
• Commands available in the sdpcfg configuration database CLI

None of these can really be considered to provide the level of UX we likely need to provide advanced engineering operators who will need to interrogate and command the SDP system either as part of a full SKA software deployment for testing of SDP in a standalone mode where TMC is not deployed.

The intension of this feature is to develop an extremely simple MVP of an interface, possibly by extending existing functionality, possibly mocking a lot of the underlying functions to gather early feedback and start a fast feedback loop with PSI operators to establish a solution we can build in future.

Further elaboration of what functionality should be in this MVP should be discussed at or shortly after PI10 planning (possibly with an initial spike). Some possible considerations to start that are:

1. Given a running SDP system, when I use the SDP operator interface, I want to be able to see a list of processing blocks along with associated metadata so I can better understand the state of processing in the system.
2. Gen a running SDP system, I want to be able to view a dashboard of aggregated logs 
3. Given <a running SDP system?>, when I ask for a list of SDP workflows that the SDP system can currently execute, I want to be able to obtain this list including associated meta-data which tells me: 1) if the workflow has been validated against the current version of SDP or is still in an experimental state, 2) 
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