Refactor Keithley 2600 driver to use ParameterWithSetpoints for fast sweep

[trlemon]

WIP

Background

The doFastSweep method relies on "old" technology from qcodes_loop, and it also returns a Qcodes dataset which may not be desirable for all applications. Instead, it would be better to use ParameterWithSetpoints and return a numpy array.

Summary of Changes

• Remove dependence on qcodes_loop
• Use ParameterWithSetpoints with additional parameters for configuration.
• Return fast sweep data as numpy array instead of qcodes dataset.

[codecov]

Codecov Report

❌ Patch coverage is 82.05128% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.09%. Comparing base (e174a5c) to head (806fadf).

Files with missing lines	Patch %	Lines
...odes/instrument_drivers/Keithley/_Keithley_2600.py	82.05%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7851      +/-   ##
==========================================
+ Coverage   59.94%   60.09%   +0.15%     
==========================================
  Files         352      352              
  Lines       31932    31945      +13     
==========================================
+ Hits        19142    19198      +56     
+ Misses      12790    12747      -43     

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[astafan8]

looks promising!