Add workflow-inspector with saved filed view

[TimMonko]

This is a re-implementation of https://github.com/haesleinhuepf/napari-workflow-inspector

This version maintains the same matplotlib style task graph inspector. It has the addition of uploading a workflow.yaml to inspect, which previous versions didn't. It's npe2 compatible and modern napari ready. It has not been validated for its work yet with live workflow production (like with napari-assistant), but that code path is hopefully in tact.

Because this adds no dependencies, I thought it fine to just live in this repo, but it could be refactored out in the future.

This was generated mostly with the help of copilot, and perhaps I will regret adding this because I have little interest in actively maintaining qt code, instead preferring magicgui widgets and such. But, I do think this is most helpful for collaborators, and is a sanity check that my new workflow format is set up correctly.

The plot won't generate without matplotlib, but other parts of the inspector work, so I added it as an optional to keep dependencies slimmer for now. Most environments seem to end up with matplotlib eventually so I'm not too worried.

[codecov]

Codecov Report

❌ Patch coverage is 81.36364% with 82 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/ndev_workflows/widgets/_workflow_inspector.py	80.93%	82 Missing ⚠️

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[Copilot]

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