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BE change for Comfy-Org/ComfyUI_frontend#3976

Add one fetch node. Why do we need this node?
In certain situations, such as in cloud environments (RunningHub, ComfyDeploy, etc.), users cannot directly access the local disk. For some nodes, like the upcoming Tripo convert node which only provides functionality to save to local storage, in these cases we need to provide a way for users to download these files through ComfyUI's built-in fetch API.
Screenshot is