Filter regions by status in region data-source

[serdardalgic]

We can add a field to the biganimal_region data-source that would filter the regions according to their status.

For example:

data "biganimal_region" "this" {
  cloud_provider = var.cloud_provider
  project_id     = var.project_id
  filter {
    status = "active"
  }

}

This would show only the regions whose status is set to ACTIVE.

[serdardalgic]

With #209, this would also be accomplished.

[serdardalgic]

Closing this ticket in favor of promoting #209