Add curve header parameters to Lakeshore model 336, make group parameter take callable get_cmd

[simonschaal]

This driver update adds parameters to the Lakeshore 336 channel that allows query of the input channel curve header to read from the instrument:

• input_curve_number
• input_curve_name
• input_curve_sn
• input_curve_format
• input_curve_limit
• input_curve_coefficient

This is useful to verify remotely if the correct temperature calibration curve is selected.

[simonschaal]

@microsoft-github-policy-service agree company="Microsoft"

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.33%. Comparing base (d4e1e15) to head (5a2e4d8).
Report is 36 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6520   +/-   ##
=======================================
  Coverage   69.33%   69.33%           
=======================================
  Files         340      340           
  Lines       31240    31261   +21     
=======================================
+ Hits        21659    21676   +17     
- Misses       9581     9585    +4     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.