Implement optimized TriMesh wireframe rendering

[philippjfr]

Uses optimized datashader segments rendering for TriMesh wireframes and adds support for generating a wireframe using interpolation=None and aggregator='any'/'count'.

Here's the performance profiling for the initial render (which includes the time converting the trimesh to a wireframe of paths and segments):

• Add tests

[jbednar]

Looks good to me. Are False and None now synonyms? It would be good to state that explicitly somewhere.

[philippjfr]

@kcpevey Once this is merged and there's been a dev release you'll be able to speed up wiremesh plots by changing:

datashade(trimesh.edgepaths)

to:

datashade(trimesh.edgepaths, aggregator='any', interpolation=None)

[jlstevens]

Looks good to me! Happy to see this merged.

[philippjfr]

Okay, the long term plan here is that we will eventually add a Segments element and then expose that using a public TriMesh.wireframe property.

[github-actions]

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