Storage: Add method(s) to parse gs://bucket_name and gs://bucket_name/path/to/blob URIs #7693
Description
It would be very convenient if we could take a string such as gs://bucket_name/path/to/blob and download the content for it.
I propose we add a Blob.from_string classmethod, similar to BigQuery's TableReference.from_string method.
Since the Blob class requires a client object (via Bucket) to support downloads, I suggest both path and client are required arguments for Blob.from_string(path, client).