use osn pod endpoint, use collection inputs from dataset attrs

catalog/Red_River_MPI-ESM-LR_future/collection.json

catalog/Red_River_MPI-ESM-LR_historical/collection.json

catalog/Red_River_future/collection.json

catalog/Red_River_historical/collection.json

...River_MPI-ESM-LR_future_create_collection_from_zarr.ipynb

...r_MPI-ESM-LR_historical_create_collection_from_zarr.ipynb

...rchive/Red_River_future_create_collection_from_zarr.ipynb

...ve/Red_River_historical_create_collection_from_zarr.ipynb