Add fog-aliyun as backup storage provider

What does this MR do?

Add fog-aliyun as backup storage provider

Why was this MR needed?

Aliyun is the main public cloud provider in China with a large user base installing gitlab as their private code repositories. This addition package enable that cohort of users to quickly backup their(interest claim: we are one of them :p ) Gitlab instance. It'd definitely bring benefit to this portion of the users while increase the confidence of choosing Gitlab on Aliyun solution.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated
• [-] API support added
• Tests
  • [-] Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

gitlab-org/gitlab-ce#26802