Add users/:user_id/starred_projects API endpoint for projects starred by a user

lib/api/projects.rb

@@ -115,6 +115,22 @@ module API
         present_projects load_projects
       end
+
+      desc 'Get a user\'s starred projects' do
+        success Entities::BasicProjectDetails
+      end
+      params do
+        requires :user_id, type: String, desc: 'The ID or username of the user'
+        use :collection_params
+        use :statistics_params
+      end
+      get ":user_id/starred_projects" do
+        user = find_user(params[:user_id])
+        not_found!('User') unless user
+
+        starred_projects = StarredProjectsFinder.new(user).execute(current_user)
+        present_projects starred_projects
+      end
     end
     resource :projects do