Enable in memory streaming of granules

[MarkusZehner]

Instead of having to deal with tempfiles in my conversion pipeline from input format to xarray (and a final persistent zarr store) I hacked together this get function, maybe this has a wider usefulness, or maybe I did not see a more efficient solution: MarkusZehner@800386d and MarkusZehner@afb0662 . This leaves the previous functionality unless 'memfile' is the chosen local path.

My motivation for this was that earthaccess.open_virtual_mfdataset could not handle VIIRS VNP09GA.002 product. I handled this here stacathome/processors/viirs.

Happy for any feedback.