NPE1Adapter Part 1 - updated _from_npe1 conversion logic to prepare for locally defined objects

[tlambert03]

Breaking up #86 into three steps. This is part 1

• A lot of changes have been made to the_from_npe1 module itself to prepare for the shim logic of being able to recover a locally defined objects.
• A more realistic npe1-plugin, that contains a number of tricky scenarios with locally defined widgets and sample data generators.
• The general idea is that if an npe1 plugin creates a locally defined object within the scope of a hook implementation, then we store a shim "python_name" in the form __npe1shim__.hook_module::hoo_impl_shimidx. For example: __npe1shim__.npe1_module:napari_experimental_provide_dock_widget_2 means "call the napari_experimental_provide_dock_widget function in the npe1_module and retrieve the 2nd object in the list
• dependence on napari-plugin-engine has been completely removed, since all we really needed was the iter_hookimpls logic which has been recreated here.

note: this one can merge without full test coverage
steps 2 and 3 provide the 100% test coverage, but this one doesn't, as it really needs logic from those later PRs to cover it.

[codecov]

Codecov Report

Merging #124 (4d27552) into main (41c557d) will decrease coverage by 1.89%.
The diff coverage is 86.33%.

@@             Coverage Diff             @@
##              main     #124      +/-   ##
===========================================
- Coverage   100.00%   98.10%   -1.90%     
===========================================
  Files           23       24       +1     
  Lines         1355     1581     +226     
===========================================
+ Hits          1355     1551     +196     
- Misses           0       30      +30     

Impacted Files	Coverage Δ
npe2/manifest/utils.py	87.40% <75.38%> (-12.60%)	⬇️
npe2/_from_npe1.py	95.78% <92.37%> (-4.22%)	⬇️
npe2/__init__.py	100.00% <0.00%> (ø)
npe2/_plugin_manager.py	100.00% <0.00%> (ø)
npe2/manifest/schema.py	100.00% <0.00%> (ø)
npe2/_command_registry.py	100.00% <0.00%> (ø)
npe2/_dynamic_plugin.py	100.00% <0.00%> (ø)

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[nclack]

lgtm. It was very helpful talking about this earlier. I made some notes where I wasn't seeing test coverage, but I think the later pr's get those. Those notes are mostly for me. I should get to the other pr's later tonight.

[tlambert03]

Yeah correct. Mentioned this in the original post, but this one can merge without 100% coverage, tests are in part 2

[Carreau]

just split on : ? I guess using regex to validate even more sure, but if it's invalid it will anyway fail just after.

[Carreau]

+1, I can't merge because of codecov, should I deactivate it in setting for now ? It is likely due for github issues yesterday.

[Carreau]

pushed an empty commit trying to kick CI to get coverage and be able to merge