xarray_as_sits to support zarr

[dpabon]

Describe the requested improvement

Hi Gilberto @gilbertocamara thanks again for the workshop yesterday. To follow the discussion, I think having the functionality to convert an xarray object as sits will be remarkable to use local Zarr cubes. One way to achieve this can be the following in Python:

A zarr file local or remote through S3 that follows the GeoZarr convention -> open zarr with xarray -> transform the xarray to sits using xarray_as_sits -> do your analysis using sits -> convert the results to xarray using sits_as_xarray -> write the results to disk as zarr

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Currently (as far as I know), in R there is not an easy way to read zarr or GeoZarr. There is a blog entry from Pebezma: https://r-spatial.org/r/2022/09/13/zarr.html and some development in stars r-spatial/stars#663

So for the potential R implementation of xarray_as_sits or zarr_as_sits I'm not sure how this can work. Or if out of the scope of sits package.

Thanks in advance for your time and help.

Cheers,
Daniel