Create a QStyledItemDelegate to handle name updates to our layers.

[willGraham01]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?

Double-clicking a layer (technically a NodeWrappingLayer) in our GroupLayer display allows the user to input some text to change the name of the layer, but this change then does not take effect.

What does this PR do?

Adds the required custom QStyledItemDelegate subclass, QtGroupLayerItemDelegate, to handle the editing step. It is identical to the abstract class, save for how it updates the model data after receiving information from the QLineEditor editor.

References

This should hopefully address the NodeWrappingLayers aspect of #5.
It should also hopefully not result in too many conflicts with the other part of that issue. In fact, it we might even be able to combine the logic of both into the same setModelData method.

How has this PR been tested?

Is this a breaking change?

Does this PR require an update to the documentation?

Checklist:

• The code has been tested locally
• Tests have been added to cover all new functionality (unit & integration)
• The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit

[codecov]

Codecov Report

Attention: Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.

Project coverage is 58.78%. Comparing base (ea7a343) to head (5566b36).

Files	Patch %	Lines
src/napari_experimental/group_layer_qt.py	72.72%	3 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           ARC-dev-branch      #14      +/-   ##
==================================================
+ Coverage           57.97%   58.78%   +0.81%     
==================================================
  Files                   5        5              
  Lines                 138      148      +10     
==================================================
+ Hits                   80       87       +7     
- Misses                 58       61       +3     

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[willGraham01]

Closing in favour of (now merged) #19