cuSpatial Polygonize Notebook

[jarmak-nv]

Description

This PR adds a simple raster -> vector polygonization notebook.

• Each pixel is converted into a square polygon
• A GeoDataFrame is made from the polygons
• Data is read from the Raster and converted to cuDF columns

This notebook serves to be a test-showcase for cuProj. It uses Sentinel-2 imagery and each tile generates about 120M polygons.

The cuML section is largely for testing/showcasing another RAPIDS integration but I don't feel it's necessary (esp since it needs work.)

Regardless of status on the reviews, the has been applied until legal approval. It may be better for us to put this in notebook-contrib as well to prevent rasterio from being a notebook dependency.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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