[Feature] Support to Supabase Storage

## Feature Request

Supabase is an open-source Firebase alternative. That allows us to start a project with a Postgres Database, Authentication, instant APIs, Realtime subscriptions, and Storage.

My feature request is to support Supabase Storage as one of the storage providers of `libcloud`.

Many solutions use `libcloud` internally, so adding Supabase will allow many developers to integrate their solutions more easily, augmenting/improving both the `libcloud` and Supabase ecosystems.

https://supabase.com/docs/guides/storage

Start by reading the linked Supabase Storage documentation and reviewing Apache Libcloud's existing storage-provider entry points and tests. Determine the provider scope and integration requirements from those resources; done means Supabase Storage is supported as a Libcloud storage provider with coverage for the relevant behavior.

Written by the indexing model from the issue text.