Revisit the concept of config.py vs settings.py

[guffee23]

Cleanup api currently relies on env variables to run. We want to revisit the concept of modifying regtech-user-fi-management and sbl-filing-api config.py files to allow for other applications to import with less hassle.
Implementation would involve moving the pydantic objects to another file (like a settings.py) and calling them from the config.py.