Rotating video clips video

[maRci002]

The Transform widget can rotate, translate, and scale a widget without actually changing its underlying position or size. However, this can sometimes be a problem. I have turned on widget inspector to confirm Transform widget's behaviour.

https://github.com/LeGoffMael/video_editor/blob/f874eb19d76ab7d18f372445c225c471988c2860/lib/ui/transform.dart#L18

https://user-images.githubusercontent.com/8436039/235014615-d1e12adf-ec53-4917-a83f-d2b5ee28066a.mp4