Add services for Ocean Optics spectrometers

[johanmazoyer]

Official API exists in C by Ocean optics called seabreeze: https://www.oceaninsight.com/globalassets/catalog-blocks-and-images/software-downloads-installers/javadocs-api/seabreeze/html/index.html

Good python package wrapping this API seems to be python-seabreeze
https://pypi.org/project/seabreeze/
https://github.com/ap--/python-seabreeze

Address issue in ivalaginja/thd-controls#143

[ivalaginja]

This is nicely coming into shape! It looks to me like you have made the decision to not have the spectrometer run a continuous acquisition like a camera, and instead to wait for a sent acquisition command like for example the PLP power source or the DM. Is that correct? In this case, I have left you a comment to help you straighten out the main() loop. If I am interpreting this wrong though, do let me know and I will point you more in the direction of continuous acquisition loops like the cameras.

Also, could you maybe create a twin PR in https://github.com/ivalaginja/thd-controls with a new service entry for the spectrometer, so that I know which config entries to match and what that looks like?

The rest are just some minor comments that you will need to address before merging anyway and that are not critical to the service.