Pawel plesniak/incomplete stateful command transition

[PawelPlesniak]

Description

Fixes #89

Adds a new endpoint log_on_server which allows the user to publish messages in the relevant log files.

Type of change

• Documentation (non-breaking change that adds or improves the documentation)
• New feature (non-breaking change which adds functionality)
• Optimization (non-breaking, back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (whatever its nature)

Key checklist

• All tests pass (eg. python -m pytest)
• Pre-commit hooks run successfully (eg. pre-commit run --all-files)

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added or an issue has been opened to tackle that in the future.
  (Indicate issue here: # (issue))

[emmuhamm]

Just to quickly comment that I had a look over this PR on its own and this looks good to me. The changes makes sense and I don't have much to say about this.

I will review this PR again in conjunction with the big boi and will approve this if I see that this set of changes does what we want it to do there.

[emmuhamm]

I've finished the first round of reviews for the associated PR DUNE-DAQ/drunc#868. Given that theres a few comments there, theres a very small but nonzero possibility some of the functionality / names might need changing.

Therefore, although I think this PR LGTM, I'll prefer leaving this open to allow for the flexibility of changing these endpoints if desired