Data streaming: Neutron events and histograms

For DAE2/DAE3 instruments

The ICP (communicated to via the ISISDAE IOC) is responsible for communicating with the DAE2/DAE3 in terms of setting configuration, as well as streaming events and histograms from both.

For new instruments using FPGA-based acquisition electronics

kafka_dae_control is responsible for communicating with the electronics and sending run starts/stops. It will have a similar interface to ISISDAE so we can drop-in replace it in the GUI.(?)

Live view, spectra plots etc.

These will be provided by a soft IOC (kafka_dae_diagnostics) which effectively consumes from event and histogram topics (and possibly run starts?) which will serve areaDetector and other PVs.