Handle configuration variables consistently with config.Settings() class

[mcucchi9]

Related Issue(s):

• Include missing configuration variables in config.Settings class #367

Description:

This PR implements handling of ENABLE_TRANSACTIONS_EXTENSIONS, ENABLED_EXTENSIONS and UVICORN_ROOT_PATH environment configuration variables via the config.Settings class.

Closes #367

PR Checklist:

• pre-commit hooks pass locally
• Tests pass (run make test)
• Documentation has been updated to reflect changes, if applicable, and docs build successfully (run make docs)
• Changes are added to the CHANGELOG.

[hrodmn]

Thank you @mcucchi9! Looks good to me.

[hrodmn]

Actually, it would be good to add some new tests to tests/test_config.py to make sure the typical values for ENABLE_TRANSACTION_EXTENSIONS have the intended effect!

[mcucchi9]

@hrodmn right, that makes sense. The backward compatibility should be ensured by how pydantic>2 handles the bool type (here), but it's better to add some tests.