Support for providing S3 connection info via references to Secrets/ConfigMaps

[Endevir]

Description

This PR introduces new approach to provide S3 connection parameters via ConfigMap or Secret key references.

Fixes #39

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• CI/CD or infrastructure change

How Has This Been Tested?

• Unit tests
• Integration tests
• Manual tests

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