feat(storage): add delimiter support to list API

[israx]

Description of changes

This change will enable delimiter support by passing a Delimiter option in the underlying ListObjectsV2 API.

Main changes to list API:

• add subpathStrategy to input
• add excludedSubpaths to output

Issue #, if available

Description of how you validated changes

• unit tests
• smoke tests
• e2e test is pending

Checklist

• [x] PR description included
• [x] yarn test passes
• [x] Tests are changed or added
• [ ] Relevant documentation is changed or added (and PR referenced)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.