Add object support in config

[OhjeezwhathaveIdone]

Pull Request check-list

Please make sure to review and check all of these items:

• [ ] Does npm run test pass with this change (including linting)?
• [x] Does the description below contain a link to an existing issue (Closes #[issue]) or a description of the issue you are solving?
• [ ] Have you added new tests to prevent regressions?
• [ ] Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?

Description of change

Allows support for objects to be exported from .sequelizerc

Closes #12592

[WikiRik]

Hi, thanks for submitting this PR! Could you add some tests so we can prevent regression issues?