Expose `endpoint` argument in `get_s3fs_session` top-level function

[chuckwondo]

Per https://github.com/nsidc/earthaccess/discussions/482, there is a desire to be able to directly invoke get_s3fs_session from the top of earthaccess, like so:

earthaccess.get_s3fs_session(endpoint="https://nisar.asf.earthdatacloud.nasa.gov/s3credentials")

Currently, it is possible to do the following, but accessing __store__ is perhaps not desirable:

earthaccess.__store__.get_s3fs_session(endpoint="https://nisar.asf.earthdatacloud.nasa.gov/s3credentials")

[jhkennedy]

yes, this is a good idea. In the same vein, I also find this method useful and think it would be good to expose directly:

>>> earthaccess.__store__.auth.get_s3_credentials(endpoint='https://nisar.asf.earthdatacloud.nasa.gov/s3credentials')
{'accessKeyId': 'XXX',
 'secretAccessKey': 'XXX',
 'sessionToken': 'XXX',
 'expiration': '2024-06-12 20:48:21+00:00'}

and might be a nice addition to the TEA s3 credentials READMEs: https://nisar.asf.earthdatacloud.nasa.gov/s3credentialsREADME

Notably, this does not work:

>>> arthaccess.auth.Auth.get_s3_credentials(endpoint='nisar.asf.earthdatacloud.nasa.gov/s3credentials')
TypeError: Auth.get_s3_credentials() missing 1 required positional argument: 'self'

even though I think it could be provided as just a function or provided as a static method.

[JessicaS11]

For anyone interested in working on this issue, there is currently an earthaccess.get_s3fs_session() function exposed at the top level (api.py). My understanding is this issue aims specifically to include exposure of the endpoint kwarg there.

[chuckwondo]

For anyone interested in working on this issue, there is currently an earthaccess.get_s3fs_session() function exposed at the top level (api.py). My understanding is this issue aims specifically to include exposure of the endpoint kwarg there.

Yes, sorry if my original description was confusing.

[mfisher87]

How's this read to y'all?