Add AI video template

[webmonch]

This PR adds an AI video template.

Comes with a small CLI that generates the timeline and content for the video. Video is rendered based on that timeline.

End result looks like this (the images could be improved using a better model):

AIVideo.mp4

[JonnyBurger]

Huge! 🥳

Thanks a lot for sending this in.
As it's large, needing a few days to process this. This is a great addition to our list of templates!

[webmonch]

Huge! 🥳

Thanks a lot for sending this in. As it's large, needing a few days to process this. This is a great addition to our list of templates!

Glad you like it!
I may push a few minor commits later today to fix failing tests.