Add examples for usage with external tracking tools

[PythonFZ]

• metrics
• plots
• example notebooks

[codecov]

Codecov Report

Merging #636 (917fd0b) into main (a8329ee) will decrease coverage by 0.01%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##             main     #636      +/-   ##
==========================================
- Coverage   89.39%   89.38%   -0.01%     
==========================================
  Files          21       21              
  Lines        1518     1526       +8     
  Branches      582      582              
==========================================
+ Hits         1357     1364       +7     
- Misses        161      162       +1     

Flag	Coverage Δ
fulltest	89.38% <88.88%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
zntrack/core/node.py	92.14% <88.88%> (-0.21%)	⬇️

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