In hist serv w/o FairMQ, add support for input High-Water Mark + reduce logs

- Add High-water Mark setting on the ZMQ input socket with default value of 1
- Add binary option to set the HWM + help info
- Reduce the log info linked to the Histos and Canvases updates now that we send them on every update
- Add new logs when first/initial config is received
- Add periodic log to give indication that server is not stuck