Additional tests

[C-Achard]

Trying to raise coverage as much as possible by adding more unit tests and ignoring code that should not be tested (external mainly)

Arguably, since the dev_scripts folder is not used in plugin code, it could be ignored. It raises coverage slightly, but if it does make it into the plugin it'll have to be tested (especially code from #41).
Reach 90% before merging ? With the new PRs we'll see later

[codecov-commenter]

Codecov Report

Merging #42 (d2fa556) into main (a1e363e) will increase coverage by 9.72%.
The diff coverage is 83.41%.

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
+ Coverage   72.33%   82.06%   +9.72%     
==========================================
  Files          50       43       -7     
  Lines        5209     4594     -615     
==========================================
+ Hits         3768     3770       +2     
+ Misses       1441      824     -617     

Impacted Files	Coverage Δ
...ri_cellseg3d/code_models/models/model_SegResNet.py	77.77% <ø> (+5.05%)	⬆️
...ri_cellseg3d/code_models/models/wnet/soft_Ncuts.py	100.00% <ø> (+37.68%)	⬆️
napari_cellseg3d/code_plugins/plugin_metrics.py	63.93% <ø> (-0.30%)	⬇️
...ri_cellseg3d/code_plugins/plugin_model_training.py	69.97% <0.00%> (+2.38%)	⬆️
napari_cellseg3d/code_plugins/plugin_base.py	68.39% <13.33%> (-0.17%)	⬇️
napari_cellseg3d/code_models/workers.py	71.79% <33.33%> (+9.09%)	⬆️
...i_cellseg3d/code_plugins/plugin_model_inference.py	71.94% <46.37%> (+9.36%)	⬆️
napari_cellseg3d/code_models/model_framework.py	85.96% <77.77%> (+30.51%)	⬆️
napari_cellseg3d/_tests/test_models.py	97.10% <89.47%> (-2.90%)	⬇️
napari_cellseg3d/_tests/test_utils.py	96.77% <93.44%> (-3.23%)	⬇️
... and 14 more

... and 10 files with indirect coverage changes

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[MMathisLab]

lgtm!