feat: add CLI for simple template transformation

[eoinsha]

Description

Adds a SLIC Watch for running in a terminal or CI against a plain CF template.

Motivation and Context

• Aids troubleshooting
• Allows the transformation to be run without SAR App, Macro

How Has This Been Tested?

Unit tests
Manual CLI testing

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.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING.md document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[coveralls]

coverage: 97.604% (-0.01%) from 97.615%
when pulling d6f8e65 on feat/add-cli
into c7a788e on main.

[direnakkoc]