Add Support for the "Copy" method

[wjordanwood]

Feature request

Is your feature request related to a problem? Please describe.

Implement the Copy functionality that is shown on https://supabase.com/docs/guides/storage/management/copy-move-objects

Describe the solution you'd like

Add a method to the StorageFileAPI to copy a blob from one location to another, either within the same bucket, or to a separate bucket.

Describe alternatives you've considered

Instead of using the copy API, I could download from one blob and upload to another, however this makes ingress/egress at scale substantial, and increases load times.