[WIP] Add terragrunt functions so we can work with tofu/terraform

[odgrim]

Description

Now that many customers are moving to terraform some fmt/validate functions could be used with either binary. I've added simple wrappers using terragrunt to figure out which binary to use but keeping the same functionality.
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Documentation

TODOs

Please ensure all of these TODOs are completed before asking for a review.

• Ensure the branch is named correctly with the issue number. e.g: feature/new-vpc-endpoints-955 or bug/missing-count-param-434.
• Update the docs.
• Keep the changes backward compatible where possible.
• Run the pre-commit checks successfully.
• Run the relevant tests successfully.
• Ensure any 3rd party code adheres with our license policy or delete this line if its not applicable.

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