add use_node_dir to save results in the nodes directory

[PythonFZ]

• partially address Allow dvc outs in <nodes>/<node_name>/... #226
• allow dvc.<...> to store results in a dedicated node directory
• split __get__
• small bugfix with auto_init and super_init call

[codecov]

Codecov Report

Merging #353 (b60f308) into main (48cd812) will decrease coverage by 0.39%.
The diff coverage is 98.33%.

@@            Coverage Diff             @@
##             main     #353      +/-   ##
==========================================
- Coverage   96.61%   96.21%   -0.40%     
==========================================
  Files          33       33              
  Lines        1448     1481      +33     
  Branches      597      617      +20     
==========================================
+ Hits         1399     1425      +26     
- Misses         49       56       +7     

Flag	Coverage Δ
fulltest	96.21% <98.33%> (+0.01%)	⬆️
unittests	71.02% <70.00%> (-0.49%)	⬇️

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

Impacted Files	Coverage Δ
zntrack/dvc/custom_base.py	96.82% <96.96%> (+0.05%)	⬆️
zntrack/core/zntrackoption.py	95.77% <100.00%> (-0.06%)	⬇️
zntrack/dvc/__init__.py	100.00% <100.00%> (ø)
zntrack/utils/utils.py	91.81% <100.00%> (+0.22%)	⬆️
zntrack/core/jupyter.py	47.61% <0.00%> (-14.29%)	⬇️

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