Slice operator

[chrishavlin]

This PR adds support for adding 2d slices to a napari viewer.

This is a step to supporting #35 for slices and Closes #11

Still to do:

• handle the ingestion (initial push only includes data model updates)
• add tests
• update docs

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.06 🎉

Comparison is base (0eb1719) 99.72% compared to head (9e87f50) 99.79%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #53      +/-   ##
==========================================
+ Coverage   99.72%   99.79%   +0.06%     
==========================================
  Files          20       24       +4     
  Lines        1106     1452     +346     
==========================================
+ Hits         1103     1449     +346     
  Misses          3        3              

Impacted Files	Coverage Δ
src/yt_napari/_tests/test_reader.py	100.00% <ø> (ø)
src/yt_napari/_data_model.py	98.07% <100.00%> (+1.41%)	⬆️
src/yt_napari/_ds_cache.py	100.00% <100.00%> (ø)
src/yt_napari/_gui_utilities.py	100.00% <100.00%> (ø)
src/yt_napari/_model_ingestor.py	100.00% <100.00%> (ø)
src/yt_napari/_reader.py	100.00% <100.00%> (ø)
src/yt_napari/_special_loaders.py	100.00% <100.00%> (ø)
src/yt_napari/_tests/test_gui_utilities.py	100.00% <100.00%> (ø)
src/yt_napari/_tests/test_model_ingestor.py	100.00% <100.00%> (ø)
...t_napari/_tests/test_schema_version_comparisons.py	100.00% <100.00%> (ø)
... and 6 more

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[chrishavlin]

the widget loader now runs. things to fix:

• set log option by layer
• pre-sort the selections by domain width to avoid downscaling higher res regions
• tests (still)
• define the behavior when adding both slices and regions

[chrishavlin]

layer deletion bug: multiple layers. remove layer 1, cant remove layer > 1 after that. fixed

[chrishavlin]

in terms of functionality, last thing to do is refactor the notebook interface a bit for slicing.

[chrishavlin]

notebook interface (Scene) now refactored. all the functionality is done... just need to improve tests and update docs.