add save_plots and introduce new ZnTypes.PLOTS

[PythonFZ]

You can now call save_plots() in a Node to update all zn.plots() similar to DVC Live

[codecov]

Codecov Report

Merging #269 (65c95d3) into main (b40c936) will decrease coverage by 0.13%.
The diff coverage is 55.55%.

@@            Coverage Diff             @@
##             main     #269      +/-   ##
==========================================
- Coverage   71.24%   71.11%   -0.14%     
==========================================
  Files          27       27              
  Lines        1186     1191       +5     
  Branches      235      237       +2     
==========================================
+ Hits          845      847       +2     
- Misses        315      318       +3     
  Partials       26       26              

Flag	Coverage Δ
unittests	71.11% <55.55%> (-0.14%)	⬇️

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Impacted Files	Coverage Δ
zntrack/core/dvcgraph.py	67.32% <0.00%> (ø)
zntrack/core/base.py	87.71% <25.00%> (-2.29%)	⬇️
zntrack/__init__.py	100.00% <100.00%> (ø)
zntrack/utils/structs.py	100.00% <100.00%> (ø)
zntrack/zn/plots.py	68.00% <100.00%> (ø)

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