Use fsspec for all file operations.

[betolink]

There are 2 ways of accessing NASA datasets (not using back-end services) :

• On-prem datasets: if a dataset is hosted by a DAAC, the only way to get the data is using auth HTTPS requests with EDL credentials.
• Cloud datasets:
  • direct access: we are in us-west-2 and can use S3:// links (s3fs or boto3) with temporary DAAC credentials
  • HTTPS access: we are not in us-west-2, we need to use signed HTTPS requests (same as on prem)

Since both are covered by fsspec, we only need to do a little research and see if the fsspec HTTPS adapter will work as is given the proper EDL credentials or we need inject our SessionWithHeaderRedirection class.
For S3 we need to find our if we can do parallel gets (in case the user wants to actually download the data)

Finally change the name of the Accessor class to Store