Allow influx backend for idq-monitor

This adds the ability to switch between file/database backends for storage of aggregated metrics/timeseries from iDQ processes.

The backend + relevant configuration parameters are configured using the [monitor] section of configuration files. I also updated the configuration repo to connect to influx for all 4 online runs.

After this is merged in, we should redeploy with this merge request in, and install ligo-scald at CIT to allow monitoring of the various idq-stream instances at the detector sites. I have tested this on my own account and didn't run into any issues.