feat: upload video button and new video thumbnail

[WaDadidou]

Add upload video button in social feed's video tab

button: https://www.figma.com/file/WLEMAQXohIwBEPL5lsRrvK/Teritori---dApp?type=design&node-id=14682-287916&mode=design&t=CsyFyilB8z6wJh0z-4

flow: https://www.figma.com/file/WLEMAQXohIwBEPL5lsRrvK/Teritori---dApp?type=design&node-id=14683-289637&mode=design&t=CsyFyilB8z6wJh0z-4

And rework video thumbnail to use the new description field like in https://www.figma.com/file/WLEMAQXohIwBEPL5lsRrvK/Teritori---dApp?type=design&node-id=20319-162643&mode=design&t=CsyFyilB8z6wJh0z-4

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Video upload modal

Video in Jungle Feed

Videos posted as usualy (Through NewsFeedInput) have now the VideoNote PostCategory

X - No duration because onloadedmetadata is not triggered here :

teritori-dapp/packages/utils/video/index.ts

Line 9 in 1130a8a

video.onloadedmetadata = () => {

X - Have to generate thumbnail image and use it as thumbnail on Video upload if no image provided by the user.
Here : https://github.com/TERITORI/teritori-dapp/blob/1130a8ad5718fc7ced4597b323322616e4c09052/packages/utils/video/index.ts#L24-L23

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