feat: Add USBTMC support for the 3706A device.

[nfelt14]

Proposed changes

Add USBTMC support for the 3706A device.

Types of changes

What types of changes does your code introduce?
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• Functionality update (non-breaking change which updates or changes existing functionality)

Checklist

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• I have followed the guidelines in the CONTRIBUTING document
• I have signed the CLA
• I have checked to ensure there aren't other open Pull Requests for the same update/change
• I have performed a self-review of my code
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• Basic linting passes locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have added necessary documentation (if appropriate)
• I have updated the Changelog with a brief description of my changes

[codecov]

Codecov Report

Merging #97 (403b41c) into main (78e0ed7) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #97   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          168       168           
  Lines         3768      3768           
  Branches       646       646           
=========================================
  Hits          3768      3768           

Files	Coverage Δ
...rc/tm_devices/helpers/constants_and_dataclasses.py	100.00% <ø> (ø)

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