Updates a user's role in a Project (a role has to be already assigned). This role will override
any inherited roles from the Workspace (if any). user_id parameter can either be valid user's UUID
or anyone_in_workspace or anyone_in_folder. anyone_in_workspace and anyone_in_folder
are special user IDs that can be used to grant roles to anyone in the Workspace and/or Folder
respectively. Those permissions only apply to users that don't have any roles explicitly granted to
them on Project or parent resources.