Added GIF and video support in ImageFeed for VHS-VideoCombine output

[dyamagishi]

Summary

• Enabled animated GIF/WebP and video display in ImageFeed for output from the "Video Helper Suite - VideoCombine" node.
• Added a setting "🐍 Image Feed Enable VHS-VideoCombine" to allow users to choose whether to use this feature.

With this, the benefits of the ImageFeed feature can now be applied to video generation as well.

About the Different Output Formats of VideoCombine

Output from the VideoCombine node/videohelpersuite/nodes.py#L620:

return {"ui": {"gifs": [preview]}, "result": ((save_output, output_files),)}

The preview includes the following:

{
    "filename": file,
    "subfolder": subfolder,
    "type": "output" if save_output else "temp",
    "format": format,
    "frame_rate": frame_rate,  # Additional metadata
    "workflow": first_image_file,
    "fullpath": output_files[-1],
}

Issue: Since VideoCombine outputs via ui.gifs, it is not picked up by ImageFeed's ui.images monitoring.

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(This is not a standard feature of ComfyUI, but rather support for a custom node — what are your thoughts on this?)