Make RioDataset public API

[gerritholl]

Feature Request

Is your feature request related to a problem? Please describe.

The RioDataset class is defined in the module _xrimage_rasterio. The leading underscore suggests this is considered private API. In trollimage, I want to test whether a dataset is a RioDataset (for rationale, see pytroll/trollflow2#168). A way way to do that would be with isinstance(x, RioDataset), but this requires importing from a private module.

Describe the solution you'd like

I would like that RioDataset is publicly exposed.

Describe any changes to existing user workflow

N/A, I think.

Additional context

I could do type testing based on the name. This would eliminate the need to import the class. That's not very Pythonic.

I could rely on duck-typing and EAFP. Considering the potential diversity of types returned from satpys Scene.save_datasets, I'm not sure if that's a good idea.

[djhoese]

What are you doing with the instance what you've determined that it is a RioDataset?

I'd prefer not to make this public API as we home to move to rioxarray in the future which has no concept of this. I don't know enough about how rioxarray does it to know if it will need to return an object and if so what object it will return (alongside the src dask array).