Feature Request/Idea: return publication request timestamps via API

Overview of the Feature Request

In our SPA, we would like to display publication request timestamps. (When did the user submit this dataset for review?) This feature was requested by our curators so they can see how long a dataset has been waiting in review.

Dataverse APIs only provide createTime (when the dataset was initially created), lastUpdateTime (when the dataset was last updated; if a curator user edited the dataset after the publication request, this will not be the submission time of the publication request) and releaseTime.

What kind of user is the feature intended for?

API User

What inspired the request?

see above

What existing behavior do you want changed?

none

Any brand new behavior do you want to add to Dataverse?

Dataset GET requests, e.g. GET api/datasets/$DATASET_ID/versions, should return publicationRequestTime

Any open or closed issues related to this feature request?

afaik no

Start with the dataset versions endpoint, GET api/datasets/$DATASET_ID/versions, and trace how publication requests and version metadata are represented in the API response. Done means the response exposes a publicationRequestTime value that records when the dataset was submitted for review; verify the behavior with the API's existing dataset response tests.