Add data source for retrieving all service accounts from a project

[bestefreund]

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Description

Add data source for retrieving all service accounts from a project

New or Affected Resource(s)

• google_service_accounts

Potential Terraform Configuration

data "google_service_accounts" "example" {
  project = "example-project"
}

References

https://cloud.google.com/iam/docs/reference/rest/v1/projects.serviceAccounts/list

b/376066147

[melinath]

Note from triage: information for pagination support: https://github.com/hashicorp/terraform-provider-google/issues/19157 Information about plural datasources: https://github.com/hashicorp/terraform-provider-google/issues/8255