Design and implement standard telemetry/visualization protocol

[jplane]

It would be lovely to define a standard protocol for any SCXML-compliant statechart implementation to implement, for providing telemetry for logging and visualization.

This would allow folks to build various kinds of viz/debuggers/recorders etc. and use whatever backend with them.

[jplane]

obvious implementation here is websockets-based but ideally the protocol is implementation agnostic