Stricter types for Keithley_2600

[jenshnielsen]

Make 2600 driver mostly type check without the need for delegate attributes

[codecov]

Codecov Report

❌ Patch coverage is 76.19048% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.29%. Comparing base (69ef384) to head (2f12486).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
...odes/instrument_drivers/Keithley/_Keithley_2600.py	76.19%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7998      +/-   ##
==========================================
- Coverage   70.30%   70.29%   -0.01%     
==========================================
  Files         333      333              
  Lines       32401    32406       +5     
==========================================
+ Hits        22778    22781       +3     
- Misses       9623     9625       +2     

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