PSS processing - subarray monitoring and control

Why now? We are working towards integrating PSS LMC into the system, so this is going to become relevant very soon.

Scope: (OET?) TMC, CSP LMC, PSS LMC

Qualities: Maintainability, Controllability, Reliability

Processing in PSS happens in "near" realtime right after the scan or observation completes. The way the subarray state machine has been defined (see ADR-8) this is neither observable nor controllable.

There is especially no way for PSS to communicate to OET that certain sequences of scans might cause resource conflicts within this process (see explanation by c.baffa here: https://confluence.skatelescope.org/pages/viewpage.action?pageId=105416556&focusedCommentId=110793645#comment-110793645).

We should especially consider how all of this relates to commensal observing.