feat: add ImageCompare node (#7538)

## Summary

add ImageCompare node, which is high demand among custom nodes, such as
rgthree, we should support as core node

Need BE change https://github.com/comfyanonymous/ComfyUI/pull/11343

## Screenshots (if applicable)



https://github.com/user-attachments/assets/a37bdcd0-de59-4bdd-bfc7-1adbe92f5298

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7538-feat-add-ImageCompare-node-2cb6d73d36508163a7d5f4807aece01a)
by [Unito](https://www.unito.io)

src/extensions/core/index.ts

@@ -9,6 +9,7 @@ import './electronAdapter'
 import './groupNode'
 import './groupNodeManage'
 import './groupOptions'
+import './imageCompare'
 import './load3d'
 import './maskeditor'
 import './nodeTemplates'