File class

A file is either a Blosc2 dataset or a regular file on a root repository.

File(name, root, urlbase[, auth_cookie])	A file is either a Blosc2 dataset or a regular file on a root repository.
File.__getitem__(slice_)	Get a slice of the dataset.
File.get_download_url()	Get the download URL for a file.
File.fetch([slice_])	Fetch a slice of a dataset.
File.download()	Download a file to storage.
File.vlmeta	A mapping of metalayer names to their respective values.