add sadtalker as a new tab

[wwdok]

To use SadTalker, please refer to installation guide in: https://github.com/wwdok/facechain/blob/feat/add_sadtalker/doc/installation_for_talkinghead.md
or
https://github.com/wwdok/facechain/blob/feat/add_sadtalker/doc/installation_for_talkinghead_ZH.md

[wwdok]

It looks like this:

[wwdok]

Currently, the PAI-DSW seems have bug that can not display video within gradio, you can test it by the code:

import gradio as gr

with gr.Blocks() as demo:
    gr.Video()
    
demo.launch()

then upload any video you like. Normally it should display the video, but here dsw might not be able to display it.
But the code should work on user's personal computer.

[wwdok]

The last commit just added tts of microsoft edge, the UI now looks like this: