Support a collection in the modelPath config property

The configuration have a property to customize the models route:

config.modelPath = 'models';

This is a single path directory so all the models must be inside.
It would be great if I could set up a collection of files instead of a single directory

For example, I have the next project tree:

myProject/
|- index.js
|- server.js
|- config/
|- modules/
|- users_module/
|- handlers/
|- models/
|- user.model.js
|- article_module/
|- handlers/
|- models/
|- article.model.js

And my config would be:

config.modelPath = ['modules/users_module/models/user.model', 'modules/article_module/models/article.model']';

This feature can be very useful to support a large projects with modular directory structure, like the above example.

Start by tracing how config.modelPath is read and how model files are discovered; the issue does not name repository files or tests. Define completion as accepting the requested collection of model paths while preserving the existing single-directory behavior, then add or update coverage for both forms.

Written by the indexing model from the issue text.