Add access-type parameter to az apim backup / restore

[JonasHuhndorf]

Related command
az apim backup see this docs (And az apim restore)

Is your feature request related to a problem? Please describe.
As you can see in the corresponding API documentation it is possible to use an accessKey, a SystemAssignedManagedIdentity or a UserAssignedManagedIdentity. However, the az CLI does not support these options.

Describe the solution you'd like
Equally to the PowerShell module (see here for reference), it would be nice, if the az CLI would implement the AccessType-parameter as well.

Describe alternatives you've considered
There is no, if you want to use the az CLI and a
UserAssignedManagedIdentity.

Additional context
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[yonzhan]

Thank you for opening this issue, we will look into it.