Reset fifo counters when countReset chain is called

[slacrherbst]

Reset fifo counters when countReset chain is called

[ruck314]

@slacrherbst Please review 0fa5a6a

[codecov-commenter]

Codecov Report

Merging #960 (2fd2ba5) into pre-release (69e0a4b) will increase coverage by 0.00%.
Report is 9 commits behind head on pre-release.
The diff coverage is 50.00%.

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@@             Coverage Diff              @@
##           pre-release     #960   +/-   ##
============================================
  Coverage        29.73%   29.74%           
============================================
  Files               66       66           
  Lines             6739     6741    +2     
  Branches          1039     1039           
============================================
+ Hits              2004     2005    +1     
- Misses            4578     4579    +1     
  Partials           157      157           

Files Changed	Coverage Δ
python/pyrogue/_HelperFunctions.py	32.75% <33.33%> (ø)
python/pyrogue/interfaces/stream/_Fifo.py	40.90% <50.00%> (+0.90%)	⬆️
python/pyrogue/_Variable.py	60.23% <100.00%> (ø)