Add examples for usage with external tracking tools

[PythonFZ]

• metrics
• plots
• example notebooks

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.38%. Comparing base (a8329ee) to head (917fd0b).
⚠️ Report is 116 commits behind head on main.

Files with missing lines	Patch %	Lines
zntrack/core/node.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            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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