Feature/tables option for codegen

[matt-winkler]

This is a:

• [ ] bug fix PR with no breaking changes — please ensure the base branch is main
• [X] new functionality — please ensure the base branch is the latest dev/ branch
• [ ] a breaking change — please ensure the base branch is the latest dev/ branch

Description & motivation

See here

Checklist

• [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

[matt-winkler]

@joellabes Good feedback! I was wondering about the use of exclude here as well, so went ahead and added that one in + some love on integration tests.

I also moved the table_pattern and exclude parameters to the end of the macro args list in order to make a new minor version an option. Originally, was biasing towards matching the warehouse hierarchy (from lower to higher grain), but schema being ahead of database and required / non-default kind of defeats the purpose of that. Happy to move this around again if you prefer & update the Changelog accordingly.