Allow for external dependencies

[PythonFZ]

This PR will allow Nodes to be part of the Graph from different

• repositories
• commits

[codecov]

Codecov Report

Merging #649 (7676a57) into main (3809d50) will increase coverage by 0.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #649      +/-   ##
==========================================
+ Coverage   89.54%   89.74%   +0.19%     
==========================================
  Files          21       21              
  Lines        1578     1599      +21     
  Branches      617      629      +12     
==========================================
+ Hits         1413     1435      +22     
+ Misses        165      164       -1     

Flag	Coverage Δ
fulltest	89.74% <100.00%> (+0.19%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
zntrack/cli/__init__.py	85.00% <100.00%> (ø)
zntrack/core/node.py	92.74% <100.00%> (+0.23%)	⬆️
zntrack/fields/zn/__init__.py	91.66% <100.00%> (+0.31%)	⬆️
zntrack/project/zntrack_project.py	90.04% <100.00%> (+0.64%)	⬆️
zntrack/utils/__init__.py	80.68% <100.00%> (+0.22%)	⬆️

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