Add ability to set replica count per region for each shared image gallery destination region

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Description

When publishing to a Shared Image Gallery using the target_region block I would like to have an option for setting individual replica counts per regions as opposed to on global count in shared_image_gallery_replica_count.

Use Case(s)

Users may want to set different replica counts per region to reduce cost and resiliency per region.

Potential configuration

  shared_image_gallery_destination {
    subscription         = var.subscription_id
    resource_group       = var.gallery_resource_group
    gallery_name         = var.gallery
    image_name           = var.box_name
    image_version        = var.version
    storage_account_type = "Standard_LRS"
    target_region   {
       name = "us-east-1"
       replicas = 20
    }
    target_region   {
       name = "us-west-2"
       replicas = 5
    }
  }

Potential References

https://discuss.hashicorp.com/t/packer-arm-regionalreplicacount/63513

hashicorp / packer-plugin-azure