Refactor to support non-S3 configuration

[nynaalekhya]

Description

Supports non-S3 configuration

Fixes # (issue)
Fixes #8

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Steps documented in rest_local_run/README.md

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings
• I have tagged the reviewers in a comment below incase my pull request is ready for a review
• I have signed the commit message to agree to Developer Certificate of Origin (DCO) (to certify that you wrote or otherwise have the right to submit your contribution to the project.) by adding "--signoff" to my git commit command.

[aornugent]

Thanks @nynaalekhya - these changes look great! Please merge when you're ready.

@shubhamkarande13 was able to run your Postman collection successfully - Shubham, please file an issue if there were any supporting instructions that you thought were helpful.