issue106/get_models helper macro

[erkanncelen]

resolves #

This is a:

• [ ] documentation update
• [ ] bug fix with no breaking changes
• [x] new functionality
• [ ] a breaking change

All pull requests from community contributors should target the main branch (default).

Description & motivation

Added a helper macro named "get_models" in the macros/helpers section. The macro is used to get a list of all models with a specified prefix, in a specified directory.

Example: codegen.get_models(directory='marts', prefix='fct')

I mainly created this to make generate_model_yaml macro more powerful.

Example: codegen.generate_model_yaml( model_names = codegen.get_models(directory='marts', prefix='fct')

This way we can generate yamls for any set of models in our project.

Checklist

• [x] This code is associated with an issue (https://github.com/dbt-labs/dbt-codegen/issues/106) which has been triaged and [accepted for development] (https://docs.getdbt.com/docs/contributing/oss-expectations#pull-requests).
• [x] I have verified that these changes work locally
• [x] I have updated the README.md (if applicable)
• [x] I have added tests & descriptions to my models (and macros if applicable)
• [x] I have added an entry to CHANGELOG.md

[erkanncelen]

You are right, I accepted the changes in readme.

And yes, apparently I forgot to delete | trims after I reworked the test.

All done! Thanks @joellabes