Support plotting edge-centered data

[philipc2]

Proposed new feature or change:

Add support for plotting data on edges.

uxds['v1'].plot.edges()

[aaronzedwick]

Do you think this is something I can start tackling? @philipc2

[philipc2]

Do you think this is something I can start tackling? @philipc2

Feel free to. I'd explore https://hvplot.holoviz.org/ to begin with.