Promote band-level coords to data var attributes for stackstac #37
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Closes #36
As mentioned in the issue since xpystac always returns an xarray.Dataset, it needs to be careful about the conversion of coords that have "band" as their dim. In a DataArray each version that
stackstacnatively returns you end up with scalar coords per-band. I think the best way to map that onto the data variables is by using converting scalar coords to attrs.