add reader to napari-ndev

[TimMonko]

The reader is modeled after napari-bioio.
It is intended to be updated in the future, but this initial pull allows functionality without depending on napari-aicsimageio (which had many dependency conflicts) nor does it utilize the unreleased napari-bioio, which cannot be used since it is yet to be added to pypi.

In the future, there will be a custom scene widget, and the ability to input parameters from the Image Utilities container to result in files opening in or out of memory, if possible, and to select layer type.

[codecov]

Codecov Report

Attention: Patch coverage is 64.67066% with 59 lines in your changes missing coverage. Please review.

Project coverage is 80.31%. Comparing base (030671f) to head (505ab6f).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
src/napari_ndev/_napari_reader.py	59.55%	46 Missing and 9 partials ⚠️
src/napari_ndev/_tests/test_napari_reader.py	83.33%	1 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #85      +/-   ##
==========================================
- Coverage   81.68%   80.31%   -1.37%     
==========================================
  Files          23       26       +3     
  Lines        1938     2103     +165     
  Branches      125      147      +22     
==========================================
+ Hits         1583     1689     +106     
- Misses        321      368      +47     
- Partials       34       46      +12     

Flag	Coverage Δ
unittests	80.31% <64.67%> (-1.37%)	⬇️

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