[API nodes] Add backbone for supporting api nodes in ComfyUI (#7745)

* Add Ideogram generate node.

* Add staging api.

* COMFY_API_NODE_NAME node property

* switch to boolean flag and use original node name for id

* add optional to type

* Add API_NODE and common error for missing auth token (#5)

* Add Minimax Video Generation + Async Task queue polling example (#6)

* [Minimax] Show video preview and embed workflow in ouput (#7)

* [API Nodes] Send empty request body instead of empty dictionary. (#8)

* Fixed: removed function from rebase.

* Add pydantic.

* Remove uv.lock

* Remove polling operations.

* Update stubs workflow.

* Remove polling comments.

* Update stubs.

* Use pydantic v2.

* Use pydantic v2.

* Add basic OpenAITextToImage node

* Add.

* convert image to tensor.

* Improve types.

* Ruff.

* Push tests.

* Handle multi-form data.

- Don't set content-type for multi-part/form
- Use data field instead of JSON

* Change to api.comfy.org

* Handle error code 409.

* Remove nodes.

---------

Co-authored-by: bymyself <cbyrne@comfy.org>
Co-authored-by: Yoland Y <4950057+yoland68@users.noreply.github.com>

comfy/comfy_types/node_typing.py

@@ -1,7 +1,7 @@
 """Comfy-specific type hinting"""
 
 from __future__ import annotations
-from typing import Literal, TypedDict
+from typing import Literal, TypedDict, Optional
 from typing_extensions import NotRequired
 from abc import ABC, abstractmethod
 from enum import Enum
@@ -229,6 +229,8 @@ class ComfyNodeABC(ABC):
     """Flags a node as experimental, informing users that it may change or not work as expected."""
     DEPRECATED: bool
     """Flags a node as deprecated, indicating to users that they should find alternatives to this node."""
+    API_NODE: Optional[bool]
+    """Flags a node as an API node."""
 
     @classmethod
     @abstractmethod