Handle Visa IO Error on first connection

[ldantek]

Proposed changes

On first connection the check for visa_resource.read_stb() to detect messages left in the output buffer and visa_resource.clear() calls will print a warning instead of instantly failing if the visa driver or the device don't fully support those calls.

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Checklist

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (dfcded7) to head (1b0c73c).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #172   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          170       170           
  Lines         3801      3804    +3     
  Branches       643       643           
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+ Hits          3801      3804    +3     

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