Add Dataplane list api for v5

# Feature Request

_If you are missing a feature or have an idea how to improve this project that should first be discussed, please feel
free to open up a discussion._

## Which Areas Would Be Affected?

_e.g., DPF, CI, build, transfer, etc._

## Why Is the Feature Desired?

_Are there any requirements?_

## Who will sponsor this feature?

_Please @-mention the committer that will sponsor your feature_.

## Solution Proposal

_If possible, provide a (brief!) solution proposal._

The issue names a Dataplane list API for v5 but provides no files, tests, requirements, or solution proposal. Start by locating the v5 Dataplane API entry point and clarifying the expected list behavior with the sponsor; done requires an agreed scope, implementation, and tests.

Written by the indexing model from the issue text.