add sd-webui-video-extras-tab

[light-and-ray]

Info

https://github.com/light-and-ray/sd-webui-video-extras-tab
This extension is needed to process video frame by frame inside extras tab.

Checklist:

• I have read the Readme.md
• The description is written in English.
• The index.json and extension_template.json have not been modified.
• The entry is placed in the extensions directory with the .json file extension.

[light-and-ray]

Important thing I understood while developing the extension is
shared.state.assign_current_image(image_data)
And later:
image_data.close()
Inside postprocessing.py is a reason of random crashes in extras tab. I broke my whole head, before i tested it with regular big batch from dir. )) It should be fixed. Maybe I will make a PR inside webui later. And also it's better to use output images as preview, it can solve two problems by one time.

[light-and-ray]

I've made
AUTOMATIC1111/stable-diffusion-webui#14699

[w-e-w]

I was just reading that PR moments ago

tip youi can write your commsnts like this

- https://github.com/AUTOMATIC1111/stable-diffusion-webui/pull/14699

and it will look like this

• [Bug] Fix extras big batch crashes stable-diffusion-webui#14699

[w-e-w]

some issues doesn't prevent it from you you're working, I fixed some of it

• [Bug]: Layout is broken stable-diffusion-webui#14733