feat: Output resource group id and properties as a resource map

[jceval]

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Description

It would be great to have an output of resource groups built, so that they can be available to the rest of the deployment.

Describe the solution you'd like

Similar to how network outputs are implemented.

output "resource_group_ids" {
value = local.resource_group_ids
description = "A map of resource group ids, keyed by the var.resource_groups input map. Only populated if the resourcegroup submodule is enabled."
}

Additional context