Minor earthaccess.download updates

[jrbourbeau]

This PR contains a few ergonomic updates to earthaccess.download. Specifically:

1. earthaccess.download now accepts a single granule as input in addition to a list of granules
2. The files returned by earthaccess.download are now the fully qualified local paths. This makes it easier to do things with the paths that are returned (currently there is some extra os.path.join that needs to happen)

files = earthaccess.download(...)
for file in files:
    with open(file) as f:
        ...

3. Technically local_path can be None when using earthaccess.download. We weren't accounting for that possibility in all the possible download cases (e.g. downloading from S3). This PR moves the local_path=None logic higher up in the call stack to account for these cases.

[github-actions]

👈 Launch a binder notebook on this branch for commit bbe0aff

I will automatically update this comment whenever this PR is modified

[betolink]

This is great! one of the things that confuses new users is that we only worked with list of results, thanks @jrbourbeau !!

[jrbourbeau]

one of the things that confuses new users is that we only worked with list of results

Me too : )