feat: add pause http api command

[brchri]

Adds a simple http listener with endpoints /pause and /resume GET endpoints, listening on port 8555. Calling these endpoints will pause and resume garage door operations respectively. /pause can be called with the optional query string argument duration, where the duration is the number of seconds the operations should be paused for. Omitting this or setting the value to 0 will pause indefinitely, until the app is restarted or the /resume endpoint is called. /resume can also be called to resume a timed pause operation early.

Only garage door operations are paused with this endpoint. Tracking operations will continue during a pause.

Examples:
curl http://geogdo-ip:8555/pause?duration=10 - pauses garage door operations for 10 seconds
curl http://geogdo-ip:8555/pause - pauses indefinitely
curl http://geogdo-ip:8555/resume - resumes garage door operations