Support an updated template_file until string templates are in terraform core

[nitrocode]

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Describe the Feature

The templatefile function cannot use a string. It has to use a file that has been created prior to the terraform commands.

Feature would be similar to the archived template_file data source

Unfortunately hashicorp/terraform-provider-template has been archived before darwin osx supported binary was released.

This maybe... would be a stop gap solution until PR hashicorp/terraform#28700 is implemented.

Expected Behavior

Allow creating template strings without having to create the file

Use Case

For example, if you use a data source with templated variables like the data source aws_iam_policy_document, you could previously feed in its json text into the template_file data source and allow replacements. With templatefile, you can no longer do this easily.

Describe Ideal Solution

Ideal solution would be to implement a templatestring() but custom providers cannot add new functions.

So the ideal solution would be to recreate the original data source template_file.

Alternatives Considered

• Manually create a template file containing the iam policy document, add in the appropriate variables, then use templatefile to replace them.
• Use multiple replace functions which is pretty hacky and could cause issues (example)

Additional Context

• Render templates in a different module to where they are defined hashicorp/terraform#26838
• https://gist.github.com/nitrocode/cf40a24054a66afe2b19ca54b7be5d68