Add terraform version to stacks version command

[pcortada-te]

Description

Added terraform version to the stacks version output for an easy quick check when having multiple tf versions and/or changing the STACKS_TERRAFORM_VERSION variable.

Type of Change

• [ ] Bug Fix
• [x] New Feature
• [ ] Breaking Change
• [ ] Refactor
• [x] Documentation
• [ ] Other (please describe)

Checklist

• [x] I have read the contributing guidelines ~~- [ ] Existing issues have been referenced (where applicable)~~
• [x] I have verified this change is not present in other open pull requests
• [x] Functionality is documented
• [x] All code style checks pass
• [ ] New code contribution is covered by automated tests
• [ ] All new and existing tests pass

[ribejara-te]

@pcortada-te this PR is pending tests

[tchemineau]

@pcortada-te this PR is pending tests

@ribejara-te What to you recommend to run those testing ? I am working on a PR to provide somehow a way to run the tool locally within a container with the recommended minimal Python version. Would that be useful ?