[WIP] Add new endpoint with state for DPA WorkflowDump dataset

[sonjaer]

Hey, I just made a Pull Request!

Description

Motivation and Context

Have you tested this? If so, how?

Checklist for PR author(s)

• Changes are covered by unit test
• All tests pass
• Code coverage check passes
• Error handling is tested
• Errors are handled at the appropriate layer
• Errors that cannot be handled where they occur are propagated
• (optional) Changes are covered by system test
• Relevant documentation updated
• This PR has NO breaking change to public API
• This PR has breaking change to public API and it is documented

Checklist for PR reviewer(s)

• This PR has been incorporated in release note for the coming version
• Risky changes introduced by this PR have been all considered