Add ESA WorldCover plugin

[jpswinski]

Add the 10m ESA WorldCover as raster asset for sampling: https://registry.opendata.aws/esa-worldcover-vito/

[jpswinski]

Given that this is just a single dataset; instead of creating a plugin just for this, maybe it would be better to create a plugin called opendata and this is just a class in that plugin.

[dshean]

Yeah, some generalization makes sense, though STAC support and availability of vrt/indices varies by dataset.

Potentially also some differences in optimization for different cloud providers. The AWS datasets should be easy, but there are some useful datasets (e.g., the 3DEP 2-m layers) that are currently only available on Planetary Computer.

[elidwa]

This has been implemented a while back. Closing.