Structured Test Grid and Plotting Improvements

[philipc2]

Overview

• Added a structured grid example mesh generated using xESMF
• Changed the threshold to use Vector + Antemeridian plots from 100,000 elements to 10,000, otherwise default will be Rasterized with No Antemeridian, for face-centered data
• Added support for edge-centered plotting through the .plot default method
• Antemeridian polygons are now excluded by default when calling Polygon visualization methods (raster and vector)
• Removed a warning on visual artifacts, which aren't present / reproducible, so there is no need for the warning.

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[philipc2]

@erogluorhan

As we discussed today, should we make the default .plot method always rasterize our point data?