implement Ram task for ALICloud

[Lily922]

Resource Access Management (RAM) is a resource access control service provided by Alibaba Cloud. RAM enables you to centrally manage your users (such as employees, systems, or applications) and control users’ access to your resources. We can also give a RAM role to the instance so that the instance has permission to list instance(ECS) and access storage(OSS).
This is part of #4127.

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[justinsb]

In AWS I think we've found that we often end up splitting these in the long run, but we'll see :-)

[justinsb]

Thanks @LilyFaFa - great stuff!

It's going to be confusing that it's called RAM - I think everyone else calls it IAM!

/approve
/lgtm
/ok-to-test

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This pull-request has been approved by: justinsb, LilyFaFa

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