Support file-like objects in HydroShare Service
Support file-like objects in HydroShare Service

This will make writing GMS files cleaner.

This could also be used for shapefiles, but since we also have
to delete those files after writing, I'm leaving that code as
it is:

https://github.com/WikiWatershed/model-my-watershed/blob/9fa1814719a92499b08c29b009ba2a98769c657b/src/mmw/apps/export/views.py#L118-L133

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