Make axes type and unit widgets

[andy-sweet]

This replaces the label/line-edit widgets for the axis type and units metadata attributes.

It deviates a little from the design to better suit napari's layer model.

• Each axis name/type is only shown if the currently selected layer has that axis.
• Each axis can have a type from the OME-NGFF spec (napari doesn't currently use this).
• The space and time axis types can have a viewer wide unit.
• The space unit determines the scale bar unit in napari.

Tests provide decent coverage of the expected interaction with the napari model.

Closes #1

[codecov-commenter]

Codecov Report

Merging #8 (f998b9e) into main (ac6204d) will increase coverage by 34.96%. The diff coverage is 96.67%.

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@@             Coverage Diff             @@
##             main       #8       +/-   ##
===========================================
+ Coverage   50.72%   85.68%   +34.96%     
===========================================
  Files           4        9        +5     
  Lines         207      503      +296     
===========================================
+ Hits          105      431      +326     
+ Misses        102       72       -30     

Impacted Files	Coverage Δ
src/napari_metadata/_sample_data.py	25.00% <33.33%> (ø)
src/napari_metadata/_axes_type_units_widget.py	96.00% <96.00%> (ø)
src/napari_metadata/_axes_name_type_widget.py	96.61% <96.61%> (ø)
src/napari_metadata/_tests/test_widget.py	99.39% <99.39%> (-0.61%)	:arrow_down:
src/napari_metadata/__init__.py	71.42% <100.00%> (ø)
src/napari_metadata/_axis_type.py	100.00% <100.00%> (ø)
src/napari_metadata/_space_units.py	100.00% <100.00%> (ø)
src/napari_metadata/_time_units.py	100.00% <100.00%> (ø)
src/napari_metadata/_widget.py	70.44% <100.00%> (+19.32%)	:arrow_up:

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[kephale]

Something funky is going on in the slider area:

Starting off normally:

When typing the label the slider resizes:

[andy-sweet]

Something funky is going on in the slider area:

Good catch. That's a core napari bug, which you can reproduce by setting ViewerModel.dims.axis_labels. I suspect it's due to a slider widget existing for each axis/dimension and being laid out, but also being hidden. There's nothing we can do about it here, but might be worth creating an issue on napari/napari.