Add server group created_at

Registered by Pierre Prinetti

The server groups API doesn't currently expose any timestamp. It would be useful to be able to retrieve a `created_at` timestamp.

Knowing when a resource was created helps with managing resource lifecycle in busy and automated clouds.

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Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Pierre Prinetti
Direction:
Needs approval
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None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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