[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

首先阅读链接的 Supabase Storage 文档，并审查 Apache Libcloud 中现有的存储提供商入口点和测试。根据这些资源确定提供商范围和集成要求；完成的标准是 Supabase Storage 作为 Libcloud 存储提供商获得支持，并覆盖相关行为。

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