Introduce module.terraform command to expose details about Terraform installation

[radeksimko]

Background

We already obtain both Terraform constraint (required_version) and Terraform version via terraform version -json to be able to pick the right core schema and provide accurate IntelliSense relevant to the configuration/version.

As described in hashicorp/vscode-terraform#697 clients would benefit from having these details available too.

Proposal

• Introduce new custom command module.terraform to output the following response for any module URI provided as argument, similar to how existing commands module.calls or module.providers work

{
  "v": 0,
  "required_version": "~> 1.0",
  "discovered_version": "1.0.1",
  "discovered_path": "/opt/homebrew/bin/terraform"
}

[radeksimko]

(Most of) this was implemented as part of #1016

We can iterate on it in the future, e.g. by adding the discovered path.

[github-actions]

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