When creating a feature, the server may compute automatically some fields (UUIDs, timestamps, etc.) that the client may wish. Currently it needs to follow the Location header returned by the 201 response. It could be worth to have a way of getting the updated feature representation, returned as the body of the response, to save a client-server round-trip. If we don't want to impose such behaviour as required, that could be done through some "Return-Created-Feature: true" request header, optionally honored by the server.

(triggered by qgis/QGIS#57486)