Create YAML file for expanded model as part of the script

[yelenacox]

When running Term-Weaver inside of a project to expand the enums, we need the expanded model yaml file to be created.

• The script should create the yaml file with the same name as the output file path
• The source model file should be copied over, including the prefixes
• The id, name, title, and description will need to be updated with text substitution ("source" to "expanded")
• Add supported properties (include_self, is_direct, etc.) and assumptions made for text substitution for the expanded model YAML file to the README docs