Allow base model creation to take multiple tables as arguments

[Eromtap]

resolves #233

Description & motivation

Base model creation would not accept more than one table name. Altered base_model_creation.sh to iterate thru args and call generate_base_model macro for each one.

Checklist

• This code is associated with an issue which has been triaged and accepted for development.
• 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

[dbeatty10]

I like the way you are thinking @Eromtap 🤩

Could you open a feature request for this here?

[dbeatty10]

@Eromtap This bash script was originally added in #83, and it was intended to pair up with the create_base_models macro.

Do you know if a command like this would still work after your proposed changes?

dbt run-operation codegen.create_base_models --args '{"source_name": "dbt_dbeatty", "tables": ["raw_orders", "raw_customers", "asdfasdf"]}'