Fetch by a user id a combined list of multiple classes
In addition to #315 (closed), It would be nice we have a combined list of the content created by a certain user.
So, when visiting a user profile page we show the list of Papers, Comparisons, Reviews, Literature lists, Visualisations created by that user.
Example:
https://www.orkg.org/orkg/api/users/
{USER_ID}?page=0&size=10&sort=created_at,desc&classes=
{CLASSES_IDs}`
Where CLASSES_IDs is comma-separated list of classes ids.
ping: @suhasbhairav