Add route to list model types (#4846)

* Add list models route

* Better readable model types list

server.py

@@ -222,6 +222,12 @@ class PromptServer():
             embeddings = folder_paths.get_filename_list("embeddings")
             return web.json_response(list(map(lambda a: os.path.splitext(a)[0], embeddings)))
         
+        @routes.get("/models")
+        def list_model_types(request):
+            model_types = list(folder_paths.folder_names_and_paths.keys())
+
+            return web.json_response(model_types)
+
         @routes.get("/models/{folder}")
         async def get_models(request):
             folder = request.match_info.get("folder", None)