Examples should document and enable required services

[dtest]

The KMS example will fail on a fresh project with services disabled. Specifically, it currently needs the following service APIs enabled:

• cloudkms.googleapis.com
• workflows.googleapis.com
• spanner.googleapis.com
• cloudscheduler.googleapis.com

Each example should document which service APIs are needed, and maybe provide the TF for enabling those services:

resource "google_project_service" "service_api" {
  for_each = toset(["cloudkms.googleapis.com",
                    "workflows.googleapis.com",
                    "spanner.googleapis.com",
                    "cloudscheduler.googleapis.com"])
  service  = each.value
  project  = var.project_id

  disable_on_destroy = false
}

[dtest]

I just noticed the main README has the service APIs documented. I'd still find it valuable to have the examples enable these services.

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