Provider doesn't support data source: template_dir

[ghost]

This issue was originally opened by @redscaresu as hashicorp/terraform#18535. It was migrated here as a result of the provider split. The original body of the issue is below.

---

Terraform Version

Terraform v0.11.7

Terraform Configuration Files

data "template_dir" "opt_bin_foo" {
  source_dir = "${path.module}/../data/foo"
  destination_dir = "/opt/bin/foo"
}

### Crash Output
<!--
Error: module.app1_data_1.data.template_dir.opt_bin_foo: Provider doesn't support data source: template_dir
-->

### Expected Behavior
<!--
Allow me to create a data construct for template_dir
-->

### Actual Behavior
<!--
failed because the provider does not support the data source for template_dir
-->

### Steps to Reproduce
<!--
1. `terraform init`
2. `terraform apply`
-->

### Additional Context
<!--
Hi, if there a design reason why this functionality is not already included please free to
let me know.  It would be really useful to be able to use this functionality especially in
the context coreos ignition.  I have not included the debug output because it feels
like this is simply a case of missing functionality.
-->