FeatureRequest: support saving a DD as a hdf5

[alex-s-gardner]

Working with DD is fantastic but it can be rather awkward to serialize. I wonder if DD could support saving as an HDF5 with limits on what datatypes can be saved? Maybe this is out of scope or too complicated to implement... but it would be vary nice to have if possible (maybe YAXarray sterilization can be used as an template).

[rafaqz]

Probably as Zarr as well. Maybe we can just move Rasters backends here but ignore CF standards and other geo things

[asinghvi17]

Yeah, that sounds like a good idea - maybe we can commit to Xarray standards here? (specifically _ARRAY_DIMENSIONS)

Happy to help build this out if we know what we need to do, this should also make saving arbitrary datatypes easier, so long as they have a Zarr codec/writer.