Direct Workshop mod installation by Steam Workshop ID#4133

Server owners should be able to install Workshop mods directly by entering the Steam Workshop ID, without waiting for the mod to appear in the synchronized/searchable mod list.
Currently, a Workshop item can already be public and accessible by direct URL, but if Steam has not indexed it in Workshop search/API yet, hosting providers cannot add it to the server.
This creates unnecessary delays when testing or updating server mods.
A direct Workshop ID installation option would solve this problem and make mod testing and server administration much more reliable.