Specs

1. Cloud storage
2. OS type and version
3. 3.4
4. google-cloud-python version 1.9

Hi. Great job so far. I using signed urls for google cloud storage. I saw this feature was recently added on Feb 6th. I noticed that the signed url function exists only on a Blob level whereas google also allows you to generate signed urls on the bucket level. Does this function support the bucket level signed urls as well?

https://google-cloud-python.readthedocs.io/en/latest/_modules/google/cloud/storage/blob.html#Blob