[terraform] add alias for terraform workspace

[eddykaya]

This PR adds a new terraform alias to list workspaces

Description

Enable the user to run tfw as an alias for terraform workspace

Motivation and Context

List terraform workspaces quickly

How Has This Been Tested?

Run the alias

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• If my change requires a change to the documentation, I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• If I have added a new file, I also added it to clean_files.txt and formatted it using lint_clean_files.sh.
• I have added tests to cover my changes, and all the new and existing tests pass.

[cornfeedhobo]

@NoahGorny @davidpfarrell lgtm. leaving to y'all since I haven't been around as much

[eddykaya]

@Relluem94 any open issue why this is not merged into master?