add filename kwargs

[PythonFZ]

Allows e.g. zn,outs(filename="custom_data") to store the outs of this specific option not in outs.json but in custom_data.json.

[codecov]

Codecov Report

Merging #288 (2ceb7e7) into main (5bb55e5) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #288      +/-   ##
==========================================
+ Coverage   71.27%   71.29%   +0.02%     
==========================================
  Files          27       27              
  Lines        1194     1195       +1     
  Branches      238      238              
==========================================
+ Hits          851      852       +1     
  Misses        317      317              
  Partials       26       26              

Flag	Coverage Δ
unittests	71.29% <100.00%> (+0.02%)	⬆️

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Impacted Files	Coverage Δ
zntrack/core/zntrackoption.py	85.50% <100.00%> (+0.21%)	⬆️

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