GCS bucket module

[nick-stroud]

Adds a module that creates a Google Cloud Storage bucket.

Submission Checklist

• Have you installed and run this change against pre-commit? (pre-commit install)
• Are all tests passing? (make tests)
• Have you written unit tests to cover this change?
• Is unit test coverage still above 80%?
• Have you updated all applicable documentation?
• Have you followed the guidelines in our Contributing document?

[heyealex]

Looks good, thanks for making the changes!

I still have one comment open, feel free to close it if you don't think the update is needed.