Add --no-custom-node cmd flag (#3903)

* Add --no-custom-node cmd flag

* nit

main.py

@@ -5,6 +5,8 @@ import os
 import importlib.util
 import folder_paths
 import time
+from comfy.cli_args import args
+
 
 def execute_prestartup_script():
     def execute_script(script_path):
@@ -18,6 +20,9 @@ def execute_prestartup_script():
             print(f"Failed to execute startup-script: {script_path} / {e}")
         return False
 
+    if args.disable_all_custom_nodes:
+        return
+
     node_paths = folder_paths.get_folder_paths("custom_nodes")
     for custom_node_path in node_paths:
         possible_modules = os.listdir(custom_node_path)
@@ -76,7 +81,7 @@ import yaml
 import execution
 import server
 from server import BinaryEventTypes
-from nodes import init_custom_nodes
+from nodes import init_builtin_extra_nodes, init_external_custom_nodes
 import comfy.model_management
 
 def cuda_malloc_warning():
@@ -214,7 +219,11 @@ if __name__ == "__main__":
         for config_path in itertools.chain(*args.extra_model_paths_config):
             load_extra_path_config(config_path)
 
-    init_custom_nodes()
+    init_builtin_extra_nodes()
+    if not args.disable_all_custom_nodes:
+        init_external_custom_nodes()
+    else:
+        logging.info("Skipping loading of custom nodes")
 
     cuda_malloc_warning()