Add support for delta elektronika power supplies with a PSC_ETH interface

[trappitsch]

This PR adds support for delta elektronika power supplies that are equipped with a PSC_ETH interface. These are one-channel only instruments.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.20%. Comparing base (1fc7f3a) to head (23102c1).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #460   +/-   ##
=======================================
  Coverage   99.19%   99.20%           
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  Files          95       96    +1     
  Lines        9596     9648   +52     
=======================================
+ Hits         9519     9571   +52     
  Misses         77       77           

Flag	Coverage Δ
unittests	99.20% <100.00%> (+<0.01%)	⬆️

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[trappitsch]

well... i forgot the test. will come in a bit

[trappitsch]

okay, now the tests are in as well :) and i was so proud that i remembered to add it to the docs for a change ;)

[scasagrande]

just 1 quick change needed