New data source: azurerm_compute_skus

[tiwood]

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Description

This adds a new data source to query available compute SKUs for a subscription.
This is helpful to check if the desired SKU is available before the apply phase, or to check if the SKU has the desired capabilities.

Example:

data "azurerm_compute_skus" "available" {
  name     = "Standard_D2s_v3"
  location = "westus"
}

output "available_skus" {
  value = {
    for sku in data.azurerm_compute_skus.available.skus : sku.name => sku
  }
}

data.azurerm_compute_skus.available: Reading...
data.azurerm_compute_skus.available: Still reading... [10s elapsed]
data.azurerm_compute_skus.available: Read complete after 15s [id=2e93e7f8-6a87-4db2-90cc-3b8bf65e8521]

Changes to Outputs:
  + available_skus = {
      + Standard_D2s_v3 = {
          + capabilities          = {}
          + location_restrictions = []
          + name                  = "Standard_D2s_v3"
          + resource_type         = "virtualMachines"
          + size                  = "D2s_v3"
          + tier                  = "Standard"
          + zone_restrictions     = [
              + "3",
              + "1",
            ]
          + zones                 = [
              + "2",
              + "1",
              + "3",
            ]
        }
    }

You can apply this plan to save these new output values to the Terraform state, without changing any real
infrastructure.

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have checked if my changes close any open issues. If so please include appropriate closing keywords below.
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  For example: “resource_name_here - description of change e.g. adding property new_property_name_here”

Changes to existing Resource / Data Source

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• I have written new tests for my resource or datasource changes & updated any relevent documentation.
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Testing

• My submission includes Test coverage as described in the Contribution Guide and the tests pass. (if this is not possible for any reason, please include details of why you did or could not add test coverage)

Change Log

Below please provide what should go into the changelog (if anything) conforming to the Changelog Format documented here.

• azurerm_compute_skus - New data source to list available Azure Compute SKUs [New data source: azurerm_compute_skus #28382]

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[tiwood]

Tests pass:

[stephybun]

Thanks for this PR @tiwood! We no longer accept untyped data sources or resources in the provider. Before we proceed with a detailed review could I please ask you to rewrite this as a typed data source? The contributor guidelines on adding a new data source can help you with this.

[tiwood]

@stephybun, thanks for the heads-up. I've made the requested changes.