Tektronix FCA3100 counter driver

[simonzihlmann]

This implements a first version of a driver for the Tektronix FCA3100 counter.
Thanks to Axel Leblanc and Martin Endres for their work!

@jenshnielsen or @astafan8 could you please have a look?

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 45 lines in your changes are missing coverage. Please review.

Project coverage is 11.46%. Comparing base (b372037) to head (bca31e9).

Files	Patch %	Lines
...codes_contrib_drivers/drivers/Tektronix/FCA3100.py	0.00%	45 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #300      +/-   ##
==========================================
- Coverage   11.49%   11.46%   -0.04%     
==========================================
  Files         123      124       +1     
  Lines       16745    16790      +45     
==========================================
  Hits         1925     1925              
- Misses      14820    14865      +45     

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[astafan8]

Left a few comments! we can merge the PR once you respond. THank you for the contribution!