issue106/get_models helper macro

[erkanncelen]

resolves #

This is a:

• documentation update
• bug fix with no breaking changes
• 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

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

[joellabes]

Two wee tweaks but otherwise we're good to go!

[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