Terraform plan/apply after importing an empty project fails

[memes]

After importing an empty GCP project, planning or applying additional state to the project will fail with an error because the default compute service account does not exist.

Error: Error refreshing state: 1 error(s) occurred:

* module.demo.data.google_compute_default_service_account.default: 1 error(s) occurred:

* module.demo.data.google_compute_default_service_account.default: data.google_compute_default_service_account.default: Error reading GCE service account not found: googleapi: Error 403: Access Not Configured. Compute Engine API has not been used in project 382312586678 before or it is disabled. Enable it by visiting https://console.developers.google.com/apis/api/compute.googleapis.com/overview?project=NNNNNN then retry. If you enabled this API recently, wait a few minutes for the action to propagate to our systems and retry., accessNotConfigured

Fix: add a dependency on API setup to the default service account data source.

Related to: #1