Napari plugin

[brisvag]

Now that npe2 and the napari hub are getting pretty good, it would be nice to at least have blik show up in the hub.

This PR introduces some big infrastructural changes, migrating away from the clunky dataset + depictor model into a more native plugin system. Yippie!

I also take this chance to update all the testing and packaging stuff to better reflect napari plugins and napari itself. EDIT: moved it to #126 and merged separately.

Features in this PR:

• [x] separated the io stuff out into naaf. It can now be used as a library and gives reasonably simple outputs. Here, we have a simple wrapper that reshapes the output of naaf.read into napari layers.
• [x] reader plugin
  • [x] reader widget with additional options that are otherwise impossible from the napari reader interface
• [x] volume selector widget as plugin. Works with some black magic
  • [x] update automatically when new layers are added
• [x] simple filter widgets that help a tiny bit

TODO, maybe in a later PR:

• put layers in groups, rather than having to use a widget for browsing through volumes. Needs layergroups in core napari :)

[codecov[bot]]

Codecov Report

Merging #125 (538e595) into main (094aa1b) will increase coverage by 8.81%. The diff coverage is 88.63%.

@@            Coverage Diff             @@
##             main     #125      +/-   ##
==========================================
+ Coverage   78.96%   87.77%   +8.81%     
==========================================
  Files          92        8      -84     
  Lines        2101      180    -1921     
==========================================
- Hits         1659      158    -1501     
+ Misses        442       22     -420     

Impacted Files	Coverage Δ
blik/__init__.py	50.00% <ø> (-16.67%)	:arrow_down:
blik/widgets/volume_selector.py	59.09% <59.09%> (ø)
blik/widgets/file_reader.py	88.88% <88.88%> (ø)
blik/widgets/filter.py	94.11% <94.11%> (ø)
blik/_tests/conftest.py	100.00% <100.00%> (ø)
blik/_tests/test_reader.py	100.00% <100.00%> (ø)
blik/_tests/test_widget.py	100.00% <100.00%> (ø)
blik/reader.py	100.00% <100.00%> (ø)

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[brisvag]

I think it's time to get this in :) @alisterburt any thoughts?

[alisterburt]

changelog looks good and I agree having a napari plugin will be really nice! I haven't pulled it down yet and will take a look later, interested to see how you're storing the data for volume selection and making it accessible in the plugin though!