Improve CoverageJSON Ecosystem 2: Conversion tools

[chris-little]

2. A Python tool that would convert CoverageJSON objects into common frameworks like xarray, geopandas, Zarr, etc, ready for analysis and plotting.

Along the way it could do validation of "the parts the schema can't reach".

And it would also write CoverageJSON from those common frameworks although that's a little trickier as not all the information may be present.

[jonblower]

I think this would link closely with the validator in #179. Would probably be the same tool?

[jonblower]

Just a note that, at first glance, it would seem to be possible to convert between CoverageJSON and vector data cubes, e.g. for PolygonSeries and other "vector" types