HWP Supervisor type checking and refactoring

[jlashner]

The HWP supervisor agent has grown a lot since its initial release do to features required for field usage, and has become difficult to navigate.

I think it would benefit a lot from a focused refactoring to clean up its structure, and add proper type hints for more complete static type checking. If I were to do such a refactor, I'd want to do the following...

• Use a dedicated configuration object to control parameters such as instance ids and pid_max_time_since_last_update. Currently I've just thrown many of these into the HWP state object because that is accessible from many different parts of the code, but this should be put into a dedicated cfg class.
  • I would also want to switch from using command line arguments to a yaml file, since the number of arguments has grown to ~30 which is a bit unwieldy.
• Move the HWP state and the control state-machine functionality to separate modules, for better delineation between their logic.
• Complete static type checking. This may require some small structural changes, but because the module is so large and difficult to test I think this would be invaluable.