Health Check API

### Is your feature request related to a problem? Please describe With some printers that have wifi and ethernet, it's nice to have my reverse proxy set up to "load balance" the two endpoints by checking which is healthy or not when I try to access it remotely. Additionally, when I start adding more printers, I can set them up with health monitoring software to send notifications when one goes unhealthy. ### Describe the solution you'd like I'd like an endpoint that returns a JSON response to indicate the health status of the printer. This could include print related information or just printer information. If the information starts becoming verbose, a separate endpoint for each section would be useful to triage the information. For example: /health/system = system level data points (enough disk space, not overheating, etc) /health/print = print level data points (run out sensor, print status) The responses should also be combined in a /health response with separate root level keys for each narrow section. ### Describe alternatives you've considered _No response_ ### Additional information _No response_