feat: Huber Chiller support

Add support for the Huber Unichiller and Minichiller series. This is based on the documentation found here: https://www.huber-online.com/download/manuals/BAL%20OL%C3%89%20Minichiller%20Unichiller%20EN.pdf .

There are three types of commands with checksums and one type of command without checksums ("faster"). Most of the commands use a \r\n termination, so we mention that in the documentation/comments -- however two commands that rely particularly on the checksum (for status/identity) need \r termination on older models of Huber chillers, while newer models are fine with both \r and \r\n terminations.

This has been tested with Saclay and SCIPP chillers so far.