Add WanVideo Lora Select node and related functionality. Fixes #266

- Implemented the WanVideo Lora Select node in Python with input handling for low memory loading and LORA syntax processing.
- Updated the JavaScript side to register the new node and manage its widget interactions.
- Enhanced constants files to include the new node type and its corresponding ID.
- Modified existing Lora Loader and Stacker references to accommodate the new node in various workflows and UI components.
- Added example workflow JSON for the new node to demonstrate its usage.

web/comfyui/lora_stacker.js

@@ -105,6 +105,7 @@ app.registerExtension({
 
                 // Update input widget callback
                 const inputWidget = this.widgets[0];
+                this.inputWidget = inputWidget;
                 inputWidget.callback = (value) => {
                     if (isUpdating) return;
                     isUpdating = true;